What we usually recommend, but a decent combi is often enough when you get down to brass tacks.
Vaillant Ecotec Combi with actoSTOR
- Thread starter blakie8
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What we usually recommend, but a decent combi is often enough when you get down to brass tacks.
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The actostor can only be used on the 937. Even though the boilers all have very similar components the main heat exchangers have a coding resistor telling the boiler what size it is. The pcb has a code programmed in telling it what boiler it is. So if you try to get an 831 heat exchanger to run an actostor the boiler definitely would like it and throw up all kinds of fault codes. Also I'm not aware that you can't buy the boiler and store separately as the dhw bits in the boiler are slightly different. The dhw flow sensor is on the store part and not in the boiler.
Personally I'd go for the 837 as it's a lot less complicated and both boilers have the same flow limiter fitted on the cold inlet. The store works by allowing the water to be hotter and then if a blending valve is fitted then it will give a flow rate of 20lts/min with a 35-40 degree temp rise
Just so you all know i've found the actoSTOR on a Czech site, perhaps in Europe they have a more open firmware on the Ecotec's. Be worth Vaillant making it an option if you think of the price of a combi and a seperate actoSTOR.
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If it was worth it they would have done it, not a very high demand here for it.
On the continent alot of the acostors are made to sit next to the boiler, rather than behind, small storage space/property prices here dont allow for many folk to have that extra space so there designed to mount behind the boiler,
quite sure its possible with enough messing about, but its not actually worth it to then run it on a smaler combi
Oh yes... I had the "fun" job of changing the flow sensor on the store once. What a git that was!
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