hey guys can anyone tell me the difference between single channel and dual channel programmers and can you replace a mechanical timer with a digital one
the timer i have is a towerchron T2002 mechanical timer, i can have it on timer or continuous and i can either have the hot water on or the hot water and central heating on.
i want to buy a replacement but im not sure about getting the right model ect, dont really understand if the unit i have is single channel or dual channel.
would i be right in thinking the system i have is a gravity boiler then
Single channel would be used for a combi boiler where it controls the central heating only. Hot water is heated on demand, time control is irrelevant.
Dual channel is for heat only boilers, where HW is stored, and gives the end user more options, depending on the system. With a gravity HW system then CH cannot be used independantly of the HW, however with a "C, Y or S" plan system then there is additional control over HW timings.
From your description it sounds like a gravity HW/pumped CH system. Therefore you will need a dual channel programmer, and set it for a gravity HW system. The Siemens RWB 29 is an example that would suffice for your requirements.
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