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water 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. A

    Water pressure reduced when other appliances are on

    Hi all - hoping to get some advice here on a plumbing issue in our house. When we are showering / filling the bath and another appliance draws water (toilet cistern filling after flushing, tap being turned on or washing machine filling etc), the water pressure / flow to the other appliance...
  2. 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...
  3. G

    Water pressure suddenly dropped

    Recently we had reason to replace our boiler. It was on the blink and you could only con it into coming on by first turning on the hot water and then the heating. Whilst waiting for the installation one day randomly the electric shower stopped heating the water. It flashed low pressure -...
  4. J

    Water pressure - electric shower or water pump?

    Hi All, I hope you are doing well. My question is about the dilemma of installing an electric shower or a water pump instead? The hot water pressure in upstairs bathroom is a bit weak. I could get an electric shower installed but I also consider a water pump. What would you suggest? A pump...
  5. B

    Low water pressure after DIY work

    I replaced some plastic pipes and fittings on my mains inlet under the sink with copper today. First time ever attempting plumbing, but it seems ok with no leaks. At first it was all hunky dory, but I later noticed my water pressure had gone down. I’ve attached a pic. The section from the check...
  6. J

    Water pressure booster help

    Can anyone recommend a good and quiet water pressure booster? Our house is on a hill and the city water comes up the hill from the street. Our current pressure at the house is around 27 and would like to increase is it substantially. Thank you
  7. B

    Insufficient water pressure for Trition 30i - Instant water heater

    Hello, I've had one of these plumbed and wired (3KW) in to my mothers house in order to add hot water to a sink with cold tap only (ex council 60') only to be told that the available water (to the Triton 30i instant hot water heater) is coming via the main water tank not mains pressure as...
  8. N

    Low cold water pressure only in bathroom

    Hi, I’m new to the forum and would really appreciate some advice on this problem I have with my bathroom cold water pressure. We recently moved to this one bedroom flat and our hot water comes from a communal boiler in the basement. In the kitchen the water pressure is good for both hot and...
  9. Arelia

    Water pressure in British homes

    Good morning, Can anyone tell me what water pressure British homes have? Thx in advance
  10. P

    URGENT Why the sudden drop in kitchen faucet water pressure?

    Just had strange occurrence and hope someone can please help. Noticed a small leak under kitchen sink. Wanted to troubleshoot shut off valves for possible leak, so I turned them off and on moved them back-and-forth some to check for leak. Nothing. However, upon reopening both supply valves...
  11. B

    Water pressure in kitchen unbalanced query

    Hi everyone, I have a question about balanced water pressure in my kitchen. Are both the hot and cold water pressure meant to be the same, as my hot water has good pressure when fully open but the cold tap pressure has about 2-3 times more pressure when the tap is fully open almost floods the...
  12. P

    My Mains water pressure has dropped after annual boiler service

    Hi, new guy here. I've just had my annual service on my combi boiler and the mains water supply pressure appears to be lower. Is there anything they could have done to cause this?
  13. K

    Variable water pressure causing electric shower problem

    I have a B&B that has had lots of plumbing issues in the past e.g. hot water to a toilet! I am fed up of spending money so hoping someone can help as several plumbers so far have been hopeless. The latest problem is that I had an electric shower replaced because it was cycling between scalding...
  14. J

    Can you increase water pressure to your home?

    I have a unit (1 of 3), and mine is furtherest from the road. I have fairly crap water pressure and have had the water corp out, who agree its crap, but claim its due to the distance from the mains. Is there something that can be done to increase water pressure?
  15. A

    Do you have balance hot and cold water pressure with a combi boiler?

    So getting a digital shower and it says the hot and cold water should be balanced. Am I right in thinking they should already be balanced with the hot taking on the cold pressure entering the boiler or am I way off? Cheers
  16. F


  17. Grahampowell22

    Hot water pressure dropped on two outlets only (mega flow)

    Hi. We’ve a pressurized megaflow system and the last few weeks we’ve lost water pressure on Just two outlets in the house. The first a Keuco mixer shower were the hot outlets is just a dribble where previously it filled the bath in 5 mins and the second a Quooker tap where the tank fed supply...
  18. S

    Potterton Powermax with mains water problem

    I’ve been called out to a problem with a Potterton Powermax involved. The water pressure coming out of every tap dies off after around 30-50 secs. I took the multi-block off & pressure tested the mains where I have over 4 bar coming in. I changed the multi-block & although I have a slight...
  19. Bettyboo

    shower valves and change of water pressure?

    Hi All Thames Water recently came to fit an outside water meter and since then I have had two 1901 bristan shower cartridge/ valves dripping . Is it possible this was the cause ? When I did up the house I had a 25mm MDPE main water pipe fitted between the external stopcock to a new internal...
  20. A

    What amount of water pressure comes through a normal house ?

    Every time I use a stop end when I turn the water back on I think to my self that’s going to pop off and flood the house. What amount of pressure can they with stand ?
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