Secondary heat exchanger.

[Canton]

I think I’m going to get the secondary heat exchanger changed on my Baxi Platinum 28HE as my heating engineer has already cleaned it out a few year ago. My hot water is now once again fluctuating warm/hot as it did before. As a point of curiosity is there much difference between a 16 plate and 20 plate replacements available. Just trying to keep cost’s down too, thanks for any replies ?

 

[ShaunCorbs]

Need to be a baxi part best let your gas man get it

 

[Aire]

Do you have a magnetic filter installed?

 

[Canton]

No magnetic filter fitted !

 

[Aire]

That's why your plate exchanger is blocking up. Get your system and heat exchanger cleaned and fit a magnetic filter too.

 

[Sharp Point]

That's why your plate exchanger is blocking up. Get your system and heat exchanger cleaned and fit a magnetic filter too.

Blah......

Magnetic filters are not the be all and end all. I’ve been to many a boiler with magnetic filters and the plate still gets blocked. Not EVERYTHING is magnetic

There we go, rant over

 

[Aire]

True, but you've probably been to more blocked plates with no filter than you have with.

 

[Sharp Point]

True, but you've probably been to more blocked plates with no filter than you have with.

I have.... many times. I find it therapeutic cleaning plate exchanger ..weirdly.

 

[Sharp Point]

What I have found, is the standard of cleanliness of systems since magnetic filters has got worse. So many installers have the attitude of ‘ it’s got a filter now, doesn’t warrant a chemical flush’

 

[Rob Foster]

A good quality magnetic filter with a non magnetic strainer is no good if it is not inspected and cleaned, if the inhibitirs are not maintained ..the same. Homeowners do not maintain anything usually, rentals have to be . Centralheatking

 

[Rob Foster]

I have.. many times. I find it therapeutic cleaning plate exchanger ..weirdly.

Which plate heat exchanger would you choose...genuine ask
I might want to exchange 30 kw
Rob Foster aka centralheatking

 

[Sharp Point]

Which plate heat exchanger would you choose...genuine ask
I might want to exchange 30 kw
Rob Foster aka centralheatking

I don’t quite get your question Rob, the plates are on boilers or heat banks. So you’d have to buy the manufacturers if replacing

 

[Rob Foster]

ok , sorry what I am intrested in is a seperate heat plate heat ex. to transfer 30kw from one side to the other. its a notion I have had for a while since I advised the largest nursing home in europe about something else...they were using local plate heat ex. to provide
domestic hot water at mains pressure to numerous sub sections of the building from a central heat source via a 4 inch primary circuit ...just thought you might know as you are keen about them regards Rob

 

[Knappers]

Post a thread Rob I'm sure someone will pick it up, HW plate heat exchangers are common on commercial installs.

 

[Sharp Point]

ok , sorry what I am intrested in is a seperate heat plate heat ex. to transfer 30kw from one side to the other. its a notion I have had for a while since I advised the largest nursing home in europe about something else...they were using local plate heat ex. to provide
domestic hot water at mains pressure to numerous sub sections of the building from a central heat source via a 4 inch primary circuit ...just thought you might know as you are keen about them regards Rob

Like knappers has mentioned, it’s used in other set ups.Aren’t plates used in district heating pumping modules?

 

[Steve weightman]

Have my own method of cleaning a plate 2 plate .has anyone got different ways of doing it

 

[Knappers]

Yep and you get some inline units designed for swimming pools

 

[Knappers]

Have my own method of cleaning a plate 2 plate .has anyone got different ways of doing it

Yes, I replace them with new ones

 

[Sharp Point]

Yes, I replace them with new ones

Why, most can be brought back to life like new with simple chemical cleansing within 10 minutes

 

[Sharp Point]

I’ve only ever had one that was impossible to block and that was a Grant vortex oil combi

 

[Sharp Point]

Yep and you get some inline units designed for swimming pools

Must be special metal then, as chlorine eats stainless away.

 

[Aire]

Have my own method of cleaning a plate 2 plate .has anyone got different ways of doing it

I remove them, fill it with fx2 and leave 10 mins, give it a few shakes and a flush through with clean water. Works every time.

 

[Steve weightman]

Finding that spirit of salts does the trick. Foams up once it stops foaming rinse through jobs a good un

 

[Lewis Lawson]

Fitting an external plate heat exchanger to the system with own pump circuit. The photo shown is on to a old one pipe cast iron system sperated by a plate to the new pressured stytem.

 

[dan_the_plumber]

Personally I’d be checking the DHW NTC sensor

 

[Knappers]

Personally I’d be checking the DHW NTC sensor

I think that one's just a heat exchanger

 

[Mastermixlee]

I think I’m going to get the secondary heat exchanger changed on my Baxi Platinum 28HE as my heating engineer has already cleaned it out a few year ago. My hot water is now once again fluctuating warm/hot as it did before. As a point of curiosity is there much difference between a 16 plate and 20 plate replacements available. Just trying to keep cost’s down too, thanks for any replies ?

As others have said I'd let the GSR engineer get the parts as the heat exchanger is sized to Rubbish the specific design and output of the boiler it is fitted to. Multiple different sizes of plates normally just indicates there are various output models of that boiler range.

Fitting a different type can negatively impact performance.

Also as mentioned get a filter put on at the same time. The system will already be drained for plate replacement so best to get one fitted at same time.

 

[EvilDrPorkChop]

Personally I’d be checking the DHW NTC sensor

Also had it before where the DHW temp fluctuates and it's the DHW NTC sensor. You can tell this as the burner is constantly modulating other than getting up to 80oc+ then cutting off and firing back up.