Thermostats and TRVs

TRVs are the preferred solution for room temp. control, but there should also be a room thermostat to lock off the boiler when the house is warm.

It is not relevant that the boiler is a combi.

If you use good quality TRVs like Invensys, they work fine.

You should calculate the flows properly because it depends on radiator sizes and pipe lengths.

There is an application note on the Copper Development Association web site on how to do this.

.andy

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and no radiator stats in the room with the room stat otherwise they'll conflict

we thought about this one and are going for an electric element on a timer on the towel rail which we'll run for an hour in the morning and evening in summer.

Running the CH to dry towels seemed wastful, the room stat would need to be turned up (otherwise quite often the CH would never even come on), and you'd also be partially heating the rest of the house when you didnt need to (boiler running, hot water in pipes).

The solution have I adopted is to have the heating on for half an hour each morning with the (programmable) room stat turned up - but with all radiators manually turned off except one in the bathroom and one in the en-suite. Works a treat!