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I have an SD-ZB2502 which will not drop the nuts/raisins on programme 3, although it does it on programme 6. Has anyone else had this problem and is it possible for a programme to be corrupted in some way? I know the manual suggests that the hopper may be damp etc but the last time it failed...

It's a pellet boiler which will be installed, along with the thermal store, by a local installer who is used to these systems but not the Evohome system. I can't see why there needs to be a bypass valve between the store and the radiators. I understand the need, with some boilers, to dump...

Am looking to have a small biomass system installed and want an Evohome system as control system. Looking at some of the literature around Thermal Stores I'm puzzled as to why they need bypass valves. If all the TRV's shut at once then surely this doesn't affect the flow from the boiler to the...

Its yellow and marked indirect in felt tip pen. Can't find any other marks on it without taking it out. Size is ok. Presumably the fittings are the same size and position, whichever system it's designed for. Clearly it will work in a fully pumped system, the manufacturers of cylinders...

The Aga is going! I'm putting in a fully pumped system and wondering whether I need to replace the hot water cylinder My question is simply: How can I tell whether a hot water cylinder was designed for use with a gravity system or a fully pumped system. I believe that they are different...

Sorry, perhaps I wasn't clear. I'm moving to a fully pumped system fed from the existing oil boiler. The previous system was in fact 2 independent systems, one gravity fed from the Aga and one pumped system from the oil boiler. I'm converting to an S plan system. But my question is about the hot...

I understood that the coils were different and that the coils in a gravity tank were larges and would not be as efficient in a pumped system?

I have a hot water system that has been fed by an Aga. It's always been a bit slow to warm up. Now the Aga is going and I'm altering the system so that the oil boiler heats the hot water via an indirect cylinder, vented system. I'm just wondering if the hot water cylinder is actually fitted...