DHW flow now measured at less than 4 l/min. Should be lot higher. Engineer has changed gas valve (other unrelated problem), removed and de-scaled DHW heat exchanger, changed divertor valve and now OK, removed and checked flow regulator (aqua sensor I believe) and now OK, removed and checked DHW pump and OK also. Incoming mains filter also checked and OK and cold water pressure is fine. The whole system has been flushed and the system pressure is OK at 1.5 or thereabouts. He is scratching is head and I am frustrated, so now I am asking questions on this forum.
Having seen the engineer at work I am interested enough to find the answer for myself.
There is a small internal valve of some kind in an impellor housing in front of the DHW pump - he showed me this. Could this be faulty and restricting flow ?
Are there some adjustments to the gas valve not yet made which is restricting the boiler ?
Are there any other flow restrictors which neither he nor I are aware of?.
Any kind of advice much appreciated. We do have good central heating and some hot water but the poor flow is becoming increasingly frustrating.
Anything useful will be passed on for registered engineer to undertake.
Having seen the engineer at work I am interested enough to find the answer for myself.
There is a small internal valve of some kind in an impellor housing in front of the DHW pump - he showed me this. Could this be faulty and restricting flow ?
Are there some adjustments to the gas valve not yet made which is restricting the boiler ?
Are there any other flow restrictors which neither he nor I are aware of?.
Any kind of advice much appreciated. We do have good central heating and some hot water but the poor flow is becoming increasingly frustrating.
Anything useful will be passed on for registered engineer to undertake.