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That type of stat incorporates a anti legonella program and may be faulty and raising the temp above boiler stat set point. Mark

+1 on the locktite wonderful stuff

Imo I don't see a problem in that set up as long as there is no valve between combination valve and cylinder seen it before . Mark

Yeah held together with very small screws hard to seal on the joints I would do the job properly if I were you op, it will last longer and you will be more pleased with the result. Mark

+4 horrible things Mark

+1 to the real pin 5

What's hard-work on about that's a thermal store or combi store still mains pressure not low pressure ?

Pullers right some of it is bogs but tbh I'm not fussed they pay well and it's all pipes but rather be in a plant room sometimes especially when it p*sing down lol

You need to drain down to filing pump but not when the suns out had some very warm glycol in the tank at times my advice would be to get someone who has had experience in thermal systems to change and flush an fill also check the rest of the system over

Hpc Somerset mostly temp office etc at the moment water supplies waste water management . Mark

Agree with puller used to do bio mass but gas and elect repairs and service now better money imo but have the advantage to be involved with a nuclear new build contracts there bit different

Just connect up the solar coil in series better in fact as there is a volume of water not heated to sterilisation temp. Cheers mark

Wood pellets and wet c/h solar thermal and a thermal store works well for me, get the thatch checked, insurance isn't to bad just have a look and budget for it Mark

:D Ok has the noise stopped now ? Let us know how you get on Mark

Hi Henry this air bleed you let the air out of was it on top of the little white cylinder at the top ? If so you nee to get a plumber with unvented ticket to refill the pre charge on the expansion vessel as there won't be any now. Cheers Mark

Hi a photo of the offending unit would help in giving advice if its a megaflow the air gap would need regenerating . Mark

:D+1 on that

Hi try having a look on the gledhill site we used to use a lot solar re thermal stores to combine different heat sources and out puts at different temps. Mark

Ive seen combi preheat before they work through a set of valves,one to limit temp in to the comb normally 25/30degrees and another one to direct to taps if over a preset temp normally 60 degrees settings on the controller limit the temps in the store and hysteresis between the panel and store...

;)Would squashing the pipe behind the soil pipe be backflow protection enough