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pressure

Pressure (symbol: p or P) is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.: 445  Gauge pressure (also spelled gage pressure) is the pressure relative to the ambient pressure.
Various units are used to express pressure. Some of these derive from a unit of force divided by a unit of area; the SI unit of pressure, the pascal (Pa), for example, is one newton per square metre (N/m2); similarly, the pound-force per square inch (psi) is the traditional unit of pressure in the imperial and U.S. customary systems. Pressure may also be expressed in terms of standard atmospheric pressure; the atmosphere (atm) is equal to this pressure, and the torr is defined as 1⁄760 of this. Manometric units such as the centimetre of water, millimetre of mercury, and inch of mercury are used to express pressures in terms of the height of column of a particular fluid in a manometer.

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  1. R

    Boiler hot water issue & water pressure issue upstairs. please help!

    Hi everyone, New here & my first post! I have a Worcester greenstar 24i, it is a conventional boiler, it has a water tank upstairs. For the past year the hot water when turned on was intermittent. I repressurised the expansion vessel to 1 bar and the hot water switch when turned on worked...
  2. F

    Pressure issues Ideal Logic Combi 30

    Hi, We have a new Ideal Logic Combi 30. A radiator today came off the wall and developed a leak. Plumber came and fixed (but didn't). At that time the boiler was fine. Today the boiler has lost pressure. I have followed the videos on yt and nothing works. Just stays telling me F1. I have...
  3. D

    Uneven Shower Pressure

    Hi, we were getting uneven shower pressure and fluctuating temperature from the shower. A plumber advised that we replace the shower which we did. The temperature is now good but the water pressure is still uneven. We get mains pressure for about 2 minutes and then the pressure drops right away...
  4. D

    Uneven Shower Pressure

    Hi, My tenants were experiencing uneven pressure and temperature from the shower. Plumber advised that we replace the shower which we did. Now we have good temperature but the pressure is still uneven. The shower starts full mains pressure then after about 2 minutes it drops right away and there...
  5. A

    mains pressure lower than minimum combi system pressure

    We have a vaillant combi boiler that over ~ 2yrs loses a bit of pressure, and recently after 2 weeks away and no use the system would not fire and errored with F75. We attempted to refill, but the mains pressure is only 1.0bar, and the combi needs more than that to light. I ended up removing...
  6. Mandarin

    Low cold water pressure in only one part of the house :(

    This is doing my head in, so I am turning to the experts here for any wisdom... In the last couple of days I have very low cold water pressure in my downstairs utility room and downstairs bathroom (they back on to each other). The main cold feed (kitchen tap) is normal pressure. And all the...
  7. R

    Will shower pressure be less if switch to an unvented HW cylinder?

    Hi, am getting our bathroom updated and local company suggested ditching our traditional attic CW tank/vented cylinder and pump for the shower and install an unvented pressurised HW cylinder instead. We have been told that this will not lead to a drop in effective pressure from the shower. Is...
    • ridgerunner
    • Thread
    • cylinder pressure shower pressure
    • Replies: 4
    • Forum: Central Heating Forum
  8. B

    Elevated moisture on floor despite pipe pressure test ok

    Hi. I had a pressure test done on the toilet connection tap. Test showed no leak. However, thermal imaging showed elevated moisture levels around the tap (& toilet (on the floor). I am wondering if it is possible that there could their have been a long time (ie years) slow leak from the pipe /...
  9. MichaelO

    Water supply line pressure: one too low, one too high

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  10. I

    Combi boiler question regarding usage with no pressure

    Hi, just a quick question. Do I need to fill my combi boiler to run it for hot tap water only? I'm planning to drain the system and leave it drained a while so I can decorate and change some pipes and rads.
  11. A

    Water pressure reduced when other appliances are on

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  12. D

    Best options for finding a CH pressure leak

    I have a pressure leak on my CH system. Our piping is buried in the walls (maybe a mistake) and the room-to-room pipes are now covered by flooring making it difficult to detect any leaks if there is no yellowing happening on the ceilings below. We have noticed that we need to top up the system...
  13. C

    Water pressure for block of flats

    Hi, I will try to explain best I can, please bare in mind I am currently in a learning stage so just trying to understand the process behind things. A building with three floors and 69 rooms. How do you work out the pressure needed on the hot water system? I’m sure there is a calculation to...
  14. R

    UFH loss pressure 0 when off

    Just recently installed UFH .When all radiators and Ufh are on pressure normal floors are warm radiates are warm .When anything is turned off pressure drops to 0 with Worcester boiler flashing I have isloated it to the UFH and not boiler or radiatets could this be anything other than a leak...
  15. Z

    Faulty pressure gauge?

    Hello. Today I have installed a new radiator upstairs. A little bit bigger so I had to make new pipe work. Before that I flushed as much water from heating system as I could. Only one leg (3 legs downstairs) had valve which allowed me to flush water from radiators upstars, all of them. Only 3...
  16. D

    Low pressure on boiler, causes water leaks?

    Hello All. Sorry, im new to the forum and had a quick look around, but I couldnt find any answers. I have an HE35 Isar boiler and over the past few weeks. Ive noticed a leak coming from pipes near my toilets. Ive checked the boiler pressure and it is near zero. Could this be a the cause of the...
  17. J

    My boiler (label of Baxi) sent a 'low water pressure' warning 0.8 bar

    Hi all, My boiler is Remeha avanta ace 28c - Avanta Ace - The Feeling of Warmth - Remeha - https://www.remeha.nl/product/avanta-ace It's 1 year old, and since I'm away for a few weeks I set it to 'frost protection' mode. This morning I woke up to a 'low water pressure' warning 0.8 bar, and since...
  18. Z

    Boiler Pressure Keeps increasing - Vaillant Ecotec Plus 838

    Hello everyone, I have a Vaillant Ecotec Plus 838. The issue i have is after the heating is switched on and then left it to cool over night i see the pressure has gone up. For example yesterday it was set at 1.3 heating was switched on and when it reached its temp it went upto 1.9 so no issues...
  19. Prof Yaffle

    Combi boiler losing pressure - No leaks, many new parts, but still...

    I'll pop this into the general advice forum as it seems the most active, but mods - feel free to move if there's somewhere more appropriate. Thank you! --- Apologies, but yet another "boiler losing pressure" thread - I've read many others, but am no closer... Not my boiler (parents), so...
  20. P

    Yet Another Boiler Losing Pressure Issue

    Looking for some help here - not my boiler, so consider me a proxy. I'm also by no means a heating engineer: I'm just looking for pointers, as the owner of this boiler is now caught firmly between "not us", "not us" and "not us" - nobody will take responsibility, and just calls into question...
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