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Discuss Drayton Wiser - advice needed in the Central Heating Forum area at

Hi all

I'm going to fit a Drayton Wiser heating control system with smart TRVs for every room. I'm hoping some of you more knowledgeable people can give me some advice.

I'm heating two floors. The boiler is a Vaillant Ecotec Plus 938.

Downstairs, I have the following rooms:

  • A conservatory which acts as a dining room. The radiator here is undersized and even operating a maximum cannot bring the temperature up above about 16 degrees when it is zero outside. Mechanical TRV fitted
  • The living room has a radiator stuck in an alcove. Mechanical TRV fitted
  • An office, with the radiator stuck in one of these ridiculous radiator cabinets. Mechanical TRV fitted
  • A hallway with a single radiator. No TRV fitted
  • A bathroom with a towel radiator. No TRV fitted

  • Three bedrooms with one radiator each and all with mechanical TRVs fitted
  • One dressing room with one radiator and a mechanical TRV
  • A single hallway radiator with a mechanical TRV

I will be putting smart Drayton TRVs on all radiators. In the office and the living room, I plan to add room thermostats as well. Drayton documentation and support say that the room stat will override and control the radiator TRV (see Support - Products - --> Radiator Thermostat).

I wish to do this as the temperature inside the cabinet in the office and the temperature next to the radiator in the alcove will not read accurately due to the confined space, and so having a room thermostat should give much better control of the room temperature as far as I can tell. When describing this use case to Drayton technical support, they confirmed that combining the radiator stat with the room stat will perform in the way that I expect. For those of you with experience of this system, am I correct in this supposition that the room thermostats in the office and living room will improve the heating control in those rooms?

In the conservatory, I'm not quite sure what to do. Since the radiator is too small, if I set anything more than about a 12 degree target temperature, it will keep the boiler on pretty much permanently. I've bought a Dimplex CDE3ECC 3KW Oil Free Radiator. In an ideal world, what I would do is to use the Drayton smart plug to add this electric heater to the system to supplement the central heating radiator, but I don't believe that the Wiser system can control the smart plug based on temperature. It can control it based on schedule, so a solution would be to set a schedule for the plug that corresponds to the heating schedule for the conservatory in terms of time of operation (so that it switches on the heater at these times). The electric heater itself then has its own digital temperature regulation which I'd set to the same as the smart TRVs temperature setting. I theorize this should work?

In the hallway, there is a single radiator that is quite large that has been configured as a bypass radiator. I'd love to add a smart TRV to this radiator too. My understanding is that the Vaillant Ecotec has an automatic bypass valve and so a bypass radiator is not needed. There are two towel radiators in the bathrooms that can act as bypass radiators if necessary. Is adding a smart TRV to this hallway radiator feasible, or is it a bad idea?

Upstairs, I'm not sure if it is better to put the room thermostat in the master bedroom (which is a large space) or in the hallway. I tend to prefer a cool bedroom. I suspect the hallway is the better place for the stat.


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