New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I worry?

[munchkin19]

Can anyone tell me what this phrase means on an invoice? I've just had a new condensing boiler installed to replace a combi that was 21 years old. Is the work below enough? (The engineer said he was doing a powerflush - is that what this is? Or should I be worried?)

"Supplied and inserted all the necessary chemicals to flush and preserve the system".

Just hoping for some reassurance.

thanks!

 

[bacon_sandwich]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

sounds fine, one chemical is used to clean and another is used to protect, the protection one needs to be kept up each year to ensure corrosion does not shorten the life of the system

 

[bacon_sandwich]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Has plumber fitted a filter , it can look like a big jar with two pipes going to it.

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

sounds fine, one chemical is used to clean and another is used to protect, the protection one needs to be kept up each year to ensure corrosion does not shorten the life of the system

Thanks, Bacon Sandwich. (Great name, by the way!)

: )

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Has plumber fitted a filter , it can look like a big jar with two pipes going to it.

I haven't been in the flat to check, but he's put a Worcester Magna Filter on his invoice, so I hope so!

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

He's just emailed me to say:

"when we install any boiler we always flush the system in accordance with the manufacturers requirements"

So I dare say he's done what he's supposed to. (I just wanted to check as I was worried that any old crud might still be in the system and could damage the boiler.)

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Oops - duplicated post and don't know how to remove it.

 

[Scott_D]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

You could always go and have a look if you are worried:crazy:

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

You could always go and have a look if you are worried:crazy:

Thanks, Scott. I'm a landlord (living about 20 miles away) and can only get there at the weekend as I look after 3 x toddlers each day during the week as my real job. I"m planning to go over this weekend but I thought I would ask as I want to pay the invoice today as the work was finished yesterday.

Good point, though. ; )

 

[ShaunCorbs]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Thanks, Scott. I'm a landlord (living about 20 miles away) and can only get there at the weekend as I look after 3 x toddlers each day during the week as my real job. I"m planning to go over this weekend but I thought I would ask as I want to pay the invoice today as the work was finished yesterday.

Good point, though. ; )

When you go take some pics and post them up

 

[ShaunCorbs]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Thanks, Scott. I'm a landlord (living about 20 miles away) and can only get there at the weekend as I look after 3 x toddlers each day during the week as my real job. I"m planning to go over this weekend but I thought I would ask as I want to pay the invoice today as the work was finished yesterday.

Good point, though. ; )

When you go take some pics and post them up

 

[bacon_sandwich]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

I haven't been in the flat to check, but he's put a Worcester Magna Filter on his invoice, so I hope so!

Sounds great, when you have it checked / serviced get the guy to top up the inhibitor, he can do it easily using the filter, he will be cleaning the filter anyway (hopefully) so only takes a few seconds.

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Sounds great, when you have it checked / serviced get the guy to top up the inhibitor, he can do it easily using the filter, he will be cleaning the filter anyway (hopefully) so only takes a few seconds.

Thanks, Bacon Sandwich. That's given me the peace of mind I was looking for. I've had the guarantee registration email through from Worcester. I think it's got servicing built in there, so I'll keep a note of the dates and add "top up the inhibitor" into my calendar entry. (Memory is hopeless otherwise - lol.)

You're a diamond!

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Sounds great, when you have it checked / serviced get the guy to top up the inhibitor, he can do it easily using the filter, he will be cleaning the filter anyway (hopefully) so only takes a few seconds.

Thanks, Bacon Sandwich. That's given me the peace of mind I was looking for. I've had the guarantee registration email through from Worcester. I think it's got servicing built in there, so I'll keep a note of the dates and add "top up the inhibitor" into my calendar entry. (Memory is hopeless otherwise - lol.)

You're a diamond!

 

[CHRISX]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Duplicated post - I had edited my post below before I noticed this.

I don`t know how to just delete a post ?

This has happened to me a few times - could anyone let me know how to delete duplicates Please ?

Chris

 

[CHRISX]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Hello munchkin 19, ,

Hopefully the Heating Engineer meant the Powerflushing chemicals - hopefully either Non Acidic because of the age of your system - or including the use of a Neutralising chemical - used before the new Boiler is installed.

And also a System Cleansing chemical and Corrosion Inhibitor chemical which are added after the new Boiler has been installed.

The Powerflushing chemicals should have been used before the new Combi Boiler was installed - while the old Boiler was still in situ.

A System Cleanser chemical should have been used when the system was filled up for the first time after the new Combi was installed - the Heating should then have been operated for a period of time dependant upon the manufacturers instructions and the amount of pipework replaced to install the new Combi - in order to neutralise the soldering flux etc. that was used.

The system should then have been drained down - ideally immediately after the Cleanser has been circulating / while still reasonably Hot.

After the Boiler has been allowed to cool down the system should be `filled and drained` with Mains water and then filled again introducing the Corrosion Inhibitor chemical which protects the Boiler and Radiators fro corrosion.


Powerflushing even an `average sized` Heating system is a time consuming job - often taking a full day for a House system to be completed correctly.


Do You know how long He was at the property ?


If your previous Combi Boiler was 21 years old I wonder whether there was any replacement of the Corrosion Inhibitor since it was installed [perhaps when radiators were replaced or other alterations ?].

Perhaps there was never any Inhibitor added 21 years ago ?


Although there may not be a replacement date on most Corrosion Inhibitors I replace my Home`s Heating system Inhibitor at least every 5 Years after introducing a Cleanser for a few days - I top up the F/E Tank at least yearly to prevent bacterial growth / dilution of the chemical in the tank.


Depending upon whether there was Corrosion Inhibitor protecting the system and the amount of Radiators / more than one floor level at the property a correctly carried out Powerflush would take at least half a day or longer even for someone who was doing it every day.

In the past when I have Powerflushed for example a 3 Bedroom House it has taken me most of a Day - but I would have also removed all of the Radiators to outside and flushed them out with a Mains water hosepipe and `Radiator Hammer` into either a Road Drain Gully or a Manhole.


Many years ago after having a Powerflush done by a Company that `specialised` in that [contracted previously by the Homeowner / Landlord] I found that there was still plenty of `sludge` in the bottom of most of the Radiators.

After that experience I then made a point of checking this on systems that I was working on [mostly new Boiler installations] which had been Powerflushed [contracted out] and I found that on every system there was still `sludge` in some Radiators - not just a couple - probably half the Radiators.

I would then inform the Homeowner / Landlord / Managing Agent and quote for removing, `Flushing out` and refitting the individual Radiators before installing the new Boiler etc. - taking Photos / Video of the sludge coming out of the Radiators to show them that even after Powerflushing there is still sludge left in some Radiators.


Personally I feel that to correctly Flush out a Heating system the Radiators should be removed to outside and flushed out individually - after the `Powerflush` and I have frequently seen the evidence that shows I am correct in that approach.

I am fairly sure that this hardly ever happens.


In my opinion the Powerflush process does not generate enough pressure / flow to `lift` all of the sludge from the bottom of all of the Radiators and circulate it to be drained off - even if the `Radiator Hammer` has been used to disturb / loosen it.

The process probably does move sludge from some of the Radiators - but deposits it in others - hence my previous findings that up to about half of the Radiators in a system still have a significant amount of sludge in them after Powerflushing.


If I was Flushing out systems - depending on what paperwork needed to be produced - I would have identified the Flushing Chemicals used / Manufacturer - or at the very least the Cleanser / Corrosion Inhibitor & dosage.


Chris

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Wow, Chris,

No - bits had been replaced on the boiler during its life (can't remember what exactly), but not the radiators.

The engineer was at the property for a day and a half, and told me on the first day the boiler had been installed and the flush done. He went back on the second day to tidy up the flue outside. It's only a one bedroom flat with only 4 or 5 radiators in total, so I'm hoping he did everything right. The boiler is in now so I suppose only time will tell. I found the guy on the Worcester Bosch site when I put in my flat's postcode - haven't used him before. Plus, I couldn't be there as I'm a childminder and have children with me all week (then I've got my own two coming in from school).

I was in a flap and had to get the work done quickly as the boiler died, the tenants were rightly doing their nut with no heating in January, and it took me a week of trying to get permission from the management company at the flat (then getting it refused) for an external condensate pipe to be fitted.

The guy in the flat downstairs is a Director and was kicking up a fuss about any internal installation, insisting the pump should be completely inaudible from anywhere outside the flat (therefore in his flat downstairs). So I went with a Worcester Bosch engineer so that I could show I'd done everything in my power to ensure it had been installed by an expert. (Even though the initial guy that was going to do the job does work for my estate agent and is their trusted guy who I would much rather have used. Plus he would have been a grand cheaper.)

I'll just have to cross my fingers and hope for the best. Apparently, it's got a 10 year guarantee (which I'm waiting on coming through), so hopefully I'm OK.

Maybe when this tenant moves out, I'll get it powerflushed to be on the safe side. If you're anywhere near North London, maybe drop me a PM. Thanks again. Sounds like you do an amazing job.

Thanks for taking the time to respond, though. I really appreciate it.

 

[CHRISX]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Wow, Chris,

No - bits had been replaced on the boiler during its life (can't remember what exactly), but not the radiators.

The engineer was at the property for a day and a half, and told me on the first day the boiler had been installed and the flush done. He went back on the second day to tidy up the flue outside. It's only a one bedroom flat with only 4 or 5 radiators in total, so I'm hoping he did everything right. The boiler is in now so I suppose only time will tell. I found the guy on the Worcester Bosch site when I put in my flat's postcode - haven't used him before. Plus, I couldn't be there as I'm a childminder and have children with me all week (then I've got my own two coming in from school).

I was in a flap and had to get the work done quickly as the boiler died, the tenants were rightly doing their nut with no heating in January, and it took me a week of trying to get permission from the management company at the flat (then getting it refused) for an external condensate pipe to be fitted.

The guy in the flat downstairs is a Director and was kicking up a fuss about any internal installation, insisting the pump should be completely inaudible from anywhere outside the flat (therefore in his flat downstairs). So I went with a Worcester Bosch engineer so that I could show I'd done everything in my power to ensure it had been installed by an expert. (Even though the initial guy that was going to do the job does work for my estate agent and is their trusted guy who I would much rather have used. Plus he would have been a grand cheaper.)

I'll just have to cross my fingers and hope for the best. Apparently, it's got a 10 year guarantee (which I'm waiting on coming through), so hopefully I'm OK.

Maybe when this tenant moves out, I'll get it powerflushed to be on the safe side. If you're anywhere near North London, maybe drop me a PM. Thanks again. Sounds like you do an amazing job.

Thanks for taking the time to respond, though. I really appreciate it.

Hello again munchkin,

Hopefully He carried out the Powerflush BEFORE installing the new Combi Boiler !


Regarding the 10 year guarantee:


Please read the `Terms & Conditions` regarding the 10 year guarantee very carefully.

You must make sure that you have got the Benchmark booklet / document filled out to prove that the Boiler was Installed & Commissioned correctly by a Worcester Engineer / Gas Safe Engineer.

The Benchmark booklet / document comes with the Boiler and must have the Commissioning details correctly filled in and the Installers details in order to comply with the Building Regulations and Manufacturers warranty terms & conditions.

The Boiler installation must also be notified to Gas Safe by the Installer - Gas Safe will in turn notify the local Authority Building Control department and also You [as the owner] that it has been installed adhering to the Building Regulations and the Gas regulations.

You must also have the Boiler serviced every year to keep that in place - and you MUST ensure that you get an Invoice which details the fact that the service has been done by a Gas Safe / Worcester Engineer.

Having Worcester Bosch Engineers carrying out the service every year would be advisable as you would have irrefutable proof / a record at Worcester that You have kept to the terms of the Guarantee.

When I described what I used to do when Powerflushing a Heating system that was quite a while ago when I had access to the Powerflushing Pump / equipment via a friend who bought the equipment - I borrowed it a few times but then decided to pay Him to do any system flushing that I needed done - getting `Mates rates` because I used to also give Him some work / work with Him on some jobs.

I don`t have access to borrow that Flushing equipment now and my days of installing Central Heating / Boilers are finished due to `Age & Injuries` - so I would not be able to help you in the future with a Powerflush / Radiator removal etc.

Chris

 

[CHRISX]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Duplicated Post removed

Chris

 

[hammers4spanner]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Inserted chemicals means to me he has wee'd into the filter.

 

[steadyon]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

1. A power flush on a 12 radiator system takes about a day, 2/3 of a day if done in conjunction with a magnetic filter. If a power flush was paid for, it should have been done.

2. Most manufacturers do not insist on a power flush. They ask for a flush in accordance with the relevant British Standard (BS7593: 1992), which can be a flush with chemicals but without the use of a separate high flow pump.

I don't think you can assume from the installer's wording that a power flush has been done. If it were me, I'd ask for confirmation, in writing, that "the system was flushed in accordance with the manufacturer's instructions and dosed with inhibitor prior to completion of the installation and commissioning". I'd also want to know what flushing chemical and which inhibitor had been used.

 

[zzzjim]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Oops - duplicated post and don't know how to remove it.

Join the gang , Must have 3 characters min - got me stumped too
(Edit/Delete-button) did feel promising ! .. I need a lesson.. from admin

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Thanks, ChrisX for your advice.

That is really helpful. The invoice doesn't have a GasSafe number on it, nor does it say that the installer is a Worcester engineer, so I have drafted up an email to ask him for a revised invoice with this information on it. I hope that covers everything. This is the first time I've ever had to replace a boiler in a flat - can you tell? Thank goodness for all of you guys on the forum to keep me straight. x

"Hi, X, Thanks for your invoice. Please could you possibly amend it to include the following, then resend it to me by email?

1. your Gas Safe number on it and your Worcester identifier details

2. confirm whether or not a Powerflush was done? (Sean did say when giving his original quote that he was going to do a Powerflush, so I would expect to see that listed on the invoice.)

3. A bit that details that "the system was flushed in accordance with the manufacturer's instructions and dosed with inhibitor prior to completion of the installation and commissioning".

4. Could you also detail what flushing chemical and which inhibitor were used?

Finally, please could you also confirm that you have completed a Benchmark booklet/document to prove that the Boiler was installed and commissioned correctly by a Worcester engineer/Gas Safe Engineer, and confirm where I might find this in the flat? I am going over on Friday to have a look at the boiler and my plan is to settle your invoice after I have seen the work, and pick up any relevant paperwork while I am there, so that I can bring it back with me for safe keeping.

(I hope you don't mind me asking the above. I understand that I will need all of this stuff to comply with the terms of the guarantee.)"

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Thanks, ChrisX for your advice.

That is really helpful. The invoice doesn't have a GasSafe number on it, nor does it say that the installer is a Worcester engineer, so I have drafted up an email to ask him for a revised invoice with this information on it. I hope that covers everything. This is the first time I've ever had to replace a boiler in a flat - can you tell? Thank goodness for all of you guys on the forum to keep me straight. x

"Hi, X, Thanks for your invoice. Please could you possibly amend it to include the following, then resend it to me by email?

1. your Gas Safe number on it and your Worcester identifier details

2. confirm whether or not a Powerflush was done? (Sean did say when giving his original quote that he was going to do a Powerflush, so I would expect to see that listed on the invoice.)

3. A bit that details that "the system was flushed in accordance with the manufacturer's instructions and dosed with inhibitor prior to completion of the installation and commissioning".

4. Could you also detail what flushing chemical and which inhibitor were used?

Finally, please could you also confirm that you have completed a Benchmark booklet/document to prove that the Boiler was installed and commissioned correctly by a Worcester engineer/Gas Safe Engineer, and confirm where I might find this in the flat? I am going over on Friday to have a look at the boiler and my plan is to settle your invoice after I have seen the work, and pick up any relevant paperwork while I am there, so that I can bring it back with me for safe keeping.

(I hope you don't mind me asking the above. I understand that I will need all of this stuff to comply with the terms of the guarantee.)"

 

[CHRISX]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Thanks, ChrisX for your advice.

That is really helpful. The invoice doesn't have a GasSafe number on it, nor does it say that the installer is a Worcester engineer, so I have drafted up an email to ask him for a revised invoice with this information on it. I hope that covers everything. This is the first time I've ever had to replace a boiler in a flat - can you tell? Thank goodness for all of you guys on the forum to keep me straight. x

"Hi, X, Thanks for your invoice. Please could you possibly amend it to include the following, then resend it to me by email?

1. your Gas Safe number on it and your Worcester identifier details

2. confirm whether or not a Powerflush was done? (Sean did say when giving his original quote that he was going to do a Powerflush, so I would expect to see that listed on the invoice.)

3. A bit that details that "the system was flushed in accordance with the manufacturer's instructions and dosed with inhibitor prior to completion of the installation and commissioning".

4. Could you also detail what flushing chemical and which inhibitor were used?

Finally, please could you also confirm that you have completed a Benchmark booklet/document to prove that the Boiler was installed and commissioned correctly by a Worcester engineer/Gas Safe Engineer, and confirm where I might find this in the flat? I am going over on Friday to have a look at the boiler and my plan is to settle your invoice after I have seen the work, and pick up any relevant paperwork while I am there, so that I can bring it back with me for safe keeping.

(I hope you don't mind me asking the above. I understand that I will need all of this stuff to comply with the terms of the guarantee.)"

Hello again munchkin,

I hope that my comments have helped You to know what is required from the Boiler Installer to keep within the Terms & Conditions of the 10 Year Warranty - and of course the Yearly Servicing of the Boiler.

But please still read them carefully yourself as what I wrote was not an attempt to advise you of everything that they require.

Would You mind posting an update about the response from the Boiler Installer to your requests for the Benchmark booklet / Document - the Powerflushing details and His Gas Safe / `Worcester approved` status.

Chris

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Hello again munchkin,

I hope that my comments have helped You to know what is required from the Boiler Installer to keep within the Terms & Conditions of the 10 Year Warranty - and of course the Yearly Servicing of the Boiler.

But please still read them carefully yourself as what I wrote was not an attempt to advise you of everything that they require.

Would You mind posting an update about the response from the Boiler Installer to your requests for the Benchmark booklet / Document - the Powerflushing details and His Gas Safe / `Worcester approved` status.

Chris

Certainly, Chris.

The booklet is beside the boiler in the flat. I'm hoping to go across on Saturday to pick that up.

He didn't do a full Powerflush - he just sent me an excerpt from the manufacturer's blurb to say that he complied with that. He did give me his Gas Safe number and I checked and he is on the register, so that's good. I forgot to ask for his 'Worcester approved' information. (I'm hoping this might be filled in on the booklet that's with the boiler.)

Here's what he replied with. I went with his quote (even though it was the same as a guy who said he was going to do a full Powerflush on the system before the addition of VAT) because I believed he was a Worcester engineer. I'm hoping that this is still the case, because he did say he was able to get me a 10 year guarantee because of this. (I can just hear other guys on the forum saying - post when you've got the booklet and don't waste our time - apologies in advance.) I just wanted to respond quickly to you.

(I'll paste it below)

Anyway, hopefully all will be OK. At least the tenant has heating and hot water, so that's the main thing, plus I'm a bit more aware than I was previously. Thanks again.

"Just to clarify with regards to the flushing of the system, a powerflush was not carried out nor was it quoted for, the flushing of the system was carried as per manufacturers instructions below and it's always included in all our boiler quotes.

BEFORE CLEANING THE SYSTEM: ▶ Ensure that the system and pipe work is in good working order. ▶ Where possible keep the existing boiler/circulating pump in place when flushing the system. FOLLOW THE GUIDANCE OF BS7593: Treatment of water in domestic hot water central heating and also the flushing guidelines below. FLUSHING THE SYSTEM ▶ Fill the system with cold water and check for leaks. ▶ Open all drain cocks and drain the system. ▶ Close drain cocks and add a suitable flushing agent compatible with aluminium at the correct strength for the system conditions in accordance with the manufacturer‘s instructions.

▶ All the following Pre-Installation sections must be read and requirements met before starting boiler or flue installations. CAUTION: ▶ ISOLATE THE MAINS SUPPLIES BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS. NOTICE: ▶ Debris from the system can damage the boiler and reduce efficiency. Failure to comply with the guidelines for the use of water treatment with the appliance will invalidate the appliance guarantee. NOTICE: ARTIFICIALLY SOFTENED WATER MUST NOT BE USED TO FILL THE CENTRAL HEATING SYSTEM. PRE-INSTALLATION 6 720 815 725 (2015/05) 11 ▶ Drain and thoroughly flush the system to remove the flushing agent and debris. ▶ It may be necessary to use a power flushing machine to aid the cleansing procedure in some circumstances. ▶ Close the drain cocks and refill with fresh water and a suitable inhibitor. ▶ Vent any air from the boiler and system


Also, be assured the works has been carried to the necessary standards and the boiler does have a valid 10 year warranty.
All the necessary documents have been left on the boiler, the boiler has been registered with Worcester Bosch which I've emailed to you, the works have been notified with Gas Safe and the Buildings Control certificate will be posted to your home address, and an updated gas safety certificate will be issued via email by tomorrow the latest."

 

[munchkin19]

Re: New boiler: "Inserted necessary chemicals" - is that a Powerflush or should I wor

Hello again munchkin,

I hope that my comments have helped You to know what is required from the Boiler Installer to keep within the Terms & Conditions of the 10 Year Warranty - and of course the Yearly Servicing of the Boiler.

But please still read them carefully yourself as what I wrote was not an attempt to advise you of everything that they require.

Would You mind posting an update about the response from the Boiler Installer to your requests for the Benchmark booklet / Document - the Powerflushing details and His Gas Safe / `Worcester approved` status.

Chris

Certainly, Chris.

The booklet is beside the boiler in the flat. I'm hoping to go across on Saturday to pick that up.

He didn't do a full Powerflush - he just sent me an excerpt from the manufacturer's blurb to say that he complied with that. He did give me his Gas Safe number and I checked and he is on the register, so that's good. I forgot to ask for his 'Worcester approved' information. (I'm hoping this might be filled in on the booklet that's with the boiler.)

Here's what he replied with. I went with his quote (even though it was the same as a guy who said he was going to do a full Powerflush on the system before the addition of VAT) because I believed he was a Worcester engineer. I'm hoping that this is still the case, because he did say he was able to get me a 10 year guarantee because of this. (I can just hear other guys on the forum saying - post when you've got the booklet and don't waste our time - apologies in advance.) I just wanted to respond quickly to you.

(I'll paste it below)

Anyway, hopefully all will be OK. At least the tenant has heating and hot water, so that's the main thing, plus I'm a bit more aware than I was previously. Thanks again.

"Just to clarify with regards to the flushing of the system, a powerflush was not carried out nor was it quoted for, the flushing of the system was carried as per manufacturers instructions below and it's always included in all our boiler quotes.

BEFORE CLEANING THE SYSTEM: ▶ Ensure that the system and pipe work is in good working order. ▶ Where possible keep the existing boiler/circulating pump in place when flushing the system. FOLLOW THE GUIDANCE OF BS7593: Treatment of water in domestic hot water central heating and also the flushing guidelines below. FLUSHING THE SYSTEM ▶ Fill the system with cold water and check for leaks. ▶ Open all drain cocks and drain the system. ▶ Close drain cocks and add a suitable flushing agent compatible with aluminium at the correct strength for the system conditions in accordance with the manufacturer‘s instructions.

▶ All the following Pre-Installation sections must be read and requirements met before starting boiler or flue installations. CAUTION: ▶ ISOLATE THE MAINS SUPPLIES BEFORE STARTING ANY WORK AND OBSERVE ALL RELEVANT SAFETY PRECAUTIONS. NOTICE: ▶ Debris from the system can damage the boiler and reduce efficiency. Failure to comply with the guidelines for the use of water treatment with the appliance will invalidate the appliance guarantee. NOTICE: ARTIFICIALLY SOFTENED WATER MUST NOT BE USED TO FILL THE CENTRAL HEATING SYSTEM. PRE-INSTALLATION 6 720 815 725 (2015/05) 11 ▶ Drain and thoroughly flush the system to remove the flushing agent and debris. ▶ It may be necessary to use a power flushing machine to aid the cleansing procedure in some circumstances. ▶ Close the drain cocks and refill with fresh water and a suitable inhibitor. ▶ Vent any air from the boiler and system


Also, be assured the works has been carried to the necessary standards and the boiler does have a valid 10 year warranty.
All the necessary documents have been left on the boiler, the boiler has been registered with Worcester Bosch which I've emailed to you, the works have been notified with Gas Safe and the Buildings Control certificate will be posted to your home address, and an updated gas safety certificate will be issued via email by tomorrow the latest."