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Pressure at 3 to high how to bring it down - Water Heaters

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Pressure at 3 what?

Posted on Oct 16, 2013


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Check filling loop to see if it is closed and not letting by, may need to be replaced.

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I have a GE Profile Water Heater Model #SE40M12AA01.

I recommend safety changes to prevent ruptured water heater and assorted leaks.
135 degree hot water.
Maybe replace TP valve if it is dripping.
Drip pan under water heater with 3/4" drain line to outside.
Expansion tank on incoming cold water line to absorb pressure build-up, and prolong life of tank and plumbing.

Here's why:

1) Yes you can have scalding hot water.

2) I recommend 135 degrees since that will burn the evil right out of ya. And generally kill clothes washing bacteria.

3) 150 is dangerous and can seriously burn skin in 1.5 seconds. Not safe around children and elderly.

4) Temperature settings on electric water heater are approximate, since thermostats are calibrated approximately, and read temperature through tank wall.

5) Also if you want to increase amount of hot water for high-consumption household, then setting tank temperature upward is one solution since more cold water is mixed with hot, so amount of hot inside tank goes further.

6) High temperature can cause TP valve to release water.
TP valve is pressure-temperature safety valve. Do NOT cap off.
Rating should be 125 psi and 180 degrees ... but all things water heater are approximate, and TP valves need replacement now and then.
It is not recommended by water heater manufactures to use 150 psi TP valve when water heater came with 125 psi. Rating shows in small print on end of TP. New TP valves sold at local hardware. Let tank cool before installing new one.

7) Higher temperature and high pressure can rupture tank.
Pressure over 80 psi shortens life of water heaters and plumbing fixtures. Put BTG100 pressure gauge on water heater drain valve to check pressure.

8) You need a drip pan with 3/4" drain line to outdoors, or to drain vent line, to prevent flood caused by ruptured water heater.
Turn water heater off when going on vacation.
Inspect water heater each 6 months.
Drip pan available at local home center or hardware:

9) Heated water expands and puts pressure on tank and pipes.
Water does not compress... so when water gets hotter it expands against tank wall and against pipes.
Especially in closed system (check valve present) when system is without expansion tank.
Expansion tank is installed on incoming cold water line.

Oct 31, 2012 | Water Heaters

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PTG-74PVP-2; Where can I see/get/download a parts diagram? I continue to have O-ring failure on what appears to be the Water Flow Solenoid. The unit is installed at my vacation home, I shut down and...

Open following link for troubleshooting resources including Rheem contact information.

High water pressure might be causing problem.
Use Brady BTG-100 pressure gauge to check pressure on nearby spigot.
Add a pressure reducing valve on incoming water line.
Water heaters, tankless and tank-type are damaged by high water pressure 80 psi.
House plumbing fixtures also have shortened lifespan.

However if water pressure or water flow are too low, then burner will not activate.
Tankless are like bowling on a ship sometimes.

Repair most tankless water heater problems yourself, same day, any brand, for $320

May 02, 2011 | Rheem Paloma PTG-74PVN / RTG-74PVN...

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I have a Bosch confort 13 tankless water heater in my Mexico home. I have had problems with consistent water temperature. My contractor told me they have problems with them down there...not sure if it...

Your contractor understand the market there, but problems are mirrored in US also.
As evidenced by fixya.

1) Tankless cannot be exposed to more than 11 grains hard water, and require minimum water flow and water pressure or sensors will shut down burner or element.

2) For example, tankless might turn on with 2/3 gallon-per-minute water flow, but then another faucet is turned on so pressure and water flow drop, and tankless turns off. Or neighbor's water usage causes decrease in line flow, so tankless turns off. This is called 'cold water sandwich.'

3) If problem is water pressure, you can add in-line pressure tank, but root causes vary widely with more than one factor as suspect.

4) Also incoming water temperature can be a factor, along with temperature setting of unit. Most tankless are preset to 120 degrees F, which is modest temperature and certainly not very high. If tankless cannot raise temperature of incoming water fast enough, then tankless turns off. Of course water flow continues, so you get dose of cold water.
You can add simple120Volt 30 gallon tank-type electric heater as a tempering tank that pre-heats water either passively or actively:

5) Both internal and external factors affect tankless, with bottom line that these high-tech devices are not do-it-yourself repair for most people.

6) Install DIY tank-type gas water heater and avoid the whole headache

7) In my opinion, the genius of tankless is not that they save money or energy. Because they don't.
The genius is marketing that targets a certain affluent who believe tankless save money and energy.

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

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Your boiler has an expansion vessel that is like a bladder full of air. Yours has lost it's air pressure. Check your manual for this vessel and where the valve is to re-inflate it and what pressure to inflate to. It should have a simple tyre valve, pump it back up (usually to about 1 bar after releasing the water pressure) and should be all fixed. If you can't re-inflate the bladder is holed and the expansion vessel will need replacing.

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1 Answer

Just installed an Energy Smart 40 gallon water heater and my water pressure is about 1/2 of what it was. How do I correct this?

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Take the pipes off of the hot and cold water at the top of the heater and take the one de3vices out and you will have pressure again...


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