Reducing heating noise.

[Mr. Dazzle]

My central heating is pretty noisy under certain circumstances.

Its a traditional gas boiler set up (I.e. not combi) with four separate circuits; upstairs, downstairs, hot water tank and straight back to the boiler. The first three are on electric valves the last is just a permanently set valve with no controller.

When the heating and hot water valves turn off it suddenly gets quite noisy with the sound of water running through a partially open valve - I.e the straight back to the boiler valve - for a couple of minutes while the boiler does it cool down thing.

I assume the boiler return valve is not allowed to be an electrically controlled one for safety reasons? Is it possible to get a spring-loaded one or something that's closed when one of the other circuits is open but which opens under pressure when all the other circuits shut? I kinda feel like there is but I'm having a brain freeze on what it's called!

[Silly Car]

We’ve got a similar set up, floors 1+2, 3 & 4, water tank and return to boiler with one of these in the way:

https://www.screwfix.com/c/heating-plum ... ypassvalve

Heating engineer was more than happy with the set up when he (we) moved the boiler a couple of years ago.

Ultimate plan is to set thermostats (and boost timers) on each of the motorised valves so we can heat particular zones on demand rather than heating the whole house, very useful when my office is on the top floor...

[Mr. Dazzle]

Thats the badger!

Wasn't sure if I'd imagined it.

We've already got he multizone thermostats and timers like you're talking about. They work really well. Now that Mrs D and I work at home its useful being able to only heat upstairs in the daytime.