question about pressure

[Klarenza]

Hi,
combi boiler in the house 7 Bar from mains I have installed a prv to get pressure between 3-4 Bar. Is that correct?

 

[Bernie2]

Combi boilers have a pressure release valve set at 3 bar, so its best to fill the system at about 1 bar.

 

[REDSAW]

check on your boiler manual spec,
no bernie, the heating is not mains pressure its captive at 1-2bar.
generally 3bar cold mains to hot water sounds generall ok but a bit high depending on spec.

 

[Bernie2]

Redshaw he sounds as though he is going to fill the combi heating system although he doesn't say as much. If he charges it anywhere over about 1 bar it stands a chance of blowing off.

His water supply outside of the heating can be 3 bar, I suppose providing it makes no noise or causes errosion through excessive flow rates.

He should though as you say chec his boiler specs

 

[stevetheplumber]

Hi,
combi boiler in the house 7 Bar from mains I have installed a prv to get pressure between 3-4 Bar. Is that correct?

3-4 bar is fine most combis are rated at max preasure for inlet 10 bar but that would be noisey and cause wear

 

[Klarenza]

Thanks everybody. 7 Bar was too much I fitted PRV at 4 Bar and boiler and taps are fine.