Solid State Heating Thermostat

Discussion in 'Plumbers' Talk' started by omega1, Dec 23, 2022.

  1. omega1

    omega1 New Member

    Hi all,

    Our upstairs heating controller is a battery powered Drayton Digistat +3 and I need to replace it because it is right behind our bedroom wall and I hear it clicking in and out all night and it's driving me mad!

    I've been looking for a solid state relay to avoid the mechanical click of the relay but am struggling to find a domestic solid state thermostat to replace it with.

    Can anyone point me in the right direction?

  2. techie

    techie Screwfix Select

    I’d just move it somewhere else?
  3. quasar9

    quasar9 Screwfix Select

    Don’t know any that have any form of solid state relay. All use mechanical relay as it offers isolation from mains voltage where used as well as offering zero volt switching.
  4. Bazza-spark

    Bazza-spark Screwfix Select

    The normal relay you have will remove power from your boiler. It can't be guaranteed a solid state relay will do the same. They always leak a small current. If your boiler control sees that current then it may continue to heat when it is supposed to be off.
  5. MGW

    MGW Screwfix Select

    When I go down to our flat which has an independent thermostat, I have to listen hard to hear it click, but not a sound from my Nest Gen 3 in the main house, I am sure the heat link makes a noise, but the thermostat does not.

    Nest Gen 3 is hard wired with a 12 volt supply from heat link, but most wireless thermostats only the base makes a noise, the thermostat is silent.

    I would think modulating thermostats also make no noise, as they control up/down rather than on/off, but Drayton Wiser, and Honeywell EvoHome it's an add on extra, and the Nest heat link has both relay and OpenTherm in the same heat link box, so even when relays are doing nothing, they may click in and out, it would need to be a dedicated ebus controller.

    But my TRV's make more noise to the thermostat, quite often hear the motors running as the adjust the flow.

    What seems odd is you say upstairs heating controller, so I assume multi-thermostats around the house, and yes I have two, but in some way my two thermostats have to connect to the same area of the house, in my case where the boiler is located, and in that area we have motorised valves and pumps, all which make some noise, and I can hear next doors boiler never mind mine. So maybe it's not the relay clicking but some other device which is waking you up.
    Last edited: Dec 24, 2022

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