Hi, I have an unvented water heater which for some reason every year causes me issues.
At the end of 2023 I noticed that the pressure valve gauge was going up when the water tank was switched on. My local plumber came and re-pressured the expansion vessel as it was flat, afterwards we tested it and even with the heater switched on the pressure stayed at 3 bar, after about 20 minutes it and gone up to 3.5 bar and didn’t drop until I ran a tap, I called the plumber about this and they said it was normal.
This evening I noticed the pressure gauge was going up even though the heater hadn’t been switched on and hadn’t been for about 12 hours.
I’ve turned the water off and used the PRV to release the water, only a little came out.
I’m guessing that there is an issue with the expansion vessel and I need a new one? But just thought I’d ask for some advice as the heater hadn’t been switched on for hours.
The PRV’s and the intake valve on the gauge have all been replaced within the past three years so I’m guessing it’s not those.
Any advice welcome.
At the end of 2023 I noticed that the pressure valve gauge was going up when the water tank was switched on. My local plumber came and re-pressured the expansion vessel as it was flat, afterwards we tested it and even with the heater switched on the pressure stayed at 3 bar, after about 20 minutes it and gone up to 3.5 bar and didn’t drop until I ran a tap, I called the plumber about this and they said it was normal.
This evening I noticed the pressure gauge was going up even though the heater hadn’t been switched on and hadn’t been for about 12 hours.
I’ve turned the water off and used the PRV to release the water, only a little came out.
I’m guessing that there is an issue with the expansion vessel and I need a new one? But just thought I’d ask for some advice as the heater hadn’t been switched on for hours.
The PRV’s and the intake valve on the gauge have all been replaced within the past three years so I’m guessing it’s not those.
Any advice welcome.