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thermostat

A thermostat is a regulating device component which senses the temperature of a physical system and performs actions so that the system's temperature is maintained near a desired setpoint.
Thermostats are used in any device or system that heats or cools to a setpoint temperature, examples include building heating, central heating, air conditioners, HVAC systems, water heaters, as well as kitchen equipment including ovens and refrigerators and medical and scientific incubators. In scientific literature, these devices are often broadly classified as thermostatically controlled loads (TCLs). Thermostatically controlled loads comprise roughly 50% of the overall electricity demand in the United States.A thermostat operates as a "closed loop" control device, as it seeks to reduce the error between the desired and measured temperatures. Sometimes a thermostat combines both the sensing and control action elements of a controlled system, such as in an automotive thermostat.
The word thermostat is derived from the Greek words θερμός thermos, "hot" and στατός statos, "standing, stationary".

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  1. T

    Central heating room thermostat replacement

    Hi all, I have a simple mechanical Honeywell wall thermostat (i think you call it a 2 wire). I want to replace it as it is a bit old and unsightly and seems to have a lot of "play" between on and off. I could obviously easily replace it with the same thermostat or a very similar one, however i...
  2. P

    Worcester boiler thermostat

    Hi My boiler Worcester Comfort RF 1 thermostat states "permanently 5 degrees". I cant get my wall thermostat to go above 5 degrees. I have to put it in the fridge to trigger the boiler. My hot water is fine. Does anyone have any idea whats going on? Many thanks, Paul
  3. H

    Want to replace old thermostat with a Sensi Smart

    Want to replace an old thermostat (heat only) with a Sensi Smart thermo. Same needs a C wire. Can I connect the C wire to to the pos terminal on the transformer on the boiler?
  4. N

    Thermostat queries in a bungalow

    Why is there a thermostat in the loft, bungalow, when I already have one in the hall
  5. J

    TRV and main thermostat

    I have a Nest thermostat in my hallway which gets affected by the front door opening and closing. This thermo operates one zone (downstairs). I have one radiator the other side of the door to thermo. I have another in the study and two more in the lounge. None of the radiators have a TRV and...
  6. S

    Boiler failing to respond to thermostat and has to be restarted

    It has become a common occurrence that my boiler is failing to respond when the thermostat kicks in. I hear an audible click from the heatlink when thermostat is turned up but nothing else happens. Our heating programmer next to the water cylinder is set to continuous and all looks OK. The...
  7. S

    Boiler failing to respond to thermostat and has to be restarted

    It has become a common occurrence that my boiler is failing to respond when the thermostat kicks in. I hear an audible click from the heatlink when thermostat is turned up but nothing else happens. Our heating programmer next to the water cylinder is set to continuous and all looks OK. The...
  8. P

    Replace ancient Honeywell mechanical thermostat with a Honeywell T3R

    I would like to replace my ancient Honeywell mechanical thermostat with a Honeywell T3R PROGRAMMABLE THERMOSTAT I have three wires in the old thermostat. Please see the first three photos. 1 Red 3 Yellow 2 Blue are these 1 Live 3 Live return (Switched) 2 Neutral Could I configure it as in...
  9. johnch121

    Energenie MiHome Smart Thermostat

    I would like to install a Energenie MiHome Smart Thermostat, it has 2 wire inputs W and COM, my existing thermostat has 3 wires a red live, yellow (Not sure) and a blue wire that is connect to the earth for some reason. it is an old Altech thermostat. Does anyone know were the wires would go on...
  10. T

    Hive Thermostat to CB24

    Looking for Wiring diagram for Hive active v3 to Alpha CB24 Combi.
  11. Chris-H1711

    nest thermostat not activating central heating

    Good Morning. I've been having an issue for a couple of days, that my nest thermostat is demanding heat, but the boiler does not activate. However, when using the heat link manual button, the heating works fine for around 2 hours. I have recently replaced the pump from a wilks gold rs50 to a...
  12. R

    Water not hot after changing Room Thermostat

    HI All My room thermostat (Digistat 1) gave up the ghost in the summer so I replaced it with a Digistat+3 (same backplate) It was fine until recently (it had got colder!) when I noticed that the radiators were not as hot as they used to be and the hot water was not as hot For example: I can...
  13. T

    Can I use an alternative thermostat to Polypipe ufhprogb

    I have polypipe underfloor heating and been advised the thermostat needs replacing (blank screen after changing batteries etc). The thermostat advised is Polypipes ufhprogb - this seems out of date and so I wanted to know if I can use an alternative make / model instead or if it has to be this...
  14. thermostatguy

    Thermostat (manual, M30x1.5) does not fit on radiator (too large)

    Hi, I bought a M30x1.5 thermostat and was hoping to fit it onto the radiator (there is currently no thermostat attached), but it does not fit (the thermostat connector is too wide, see photos). Do I need an adapter or something, or a different thermostat? Thanks!
  15. S

    Is my thermostat set up normal.

    Hi guys. I moved into my house in the summer and have only just started to use the heating recently as the weather gets colder. The way my central heating is set up seems a little strange. I have a combi boiler that has the heating split into 2 zones with zone valves. Each zone controlled by...
  16. D

    IMIT CONTACT THERMOSTAT

    Has anyone else been having issues with the IMIT pipe stats recently? using contact 1 and 3 to regulate temperature on solid fuel boiler but I've had several of them turn on and just stay on even after the fire has gone out. Getting very frustrated at this stage
  17. bobster316

    replacement shower mixer valve thermostat

    Can anyone please advise which replacement shower mixer valve thermostat I need foe this shower control
  18. R

    Smart thermostat connection

    Hi all My combi boiler currently has a wireless thermostat could i just buy a smart thermostat to connect to my existing receiver or do i need a new receiver to work with a smart thermostat
  19. R

    Smart thermostat connectivity

    Can i just buy a smart thermostat to connect to my already installed receiver on my combi boiler or would i need to buy a new receiver
  20. E

    Thermostat not reaching the temperature which I have set.

    . . . Honeywell CM927 Thermostat Ethos 54C (Condensing Combination Boiler) I set the Thermostat to 26°C (79°F). The boiler fires up and heats the home to 22.5°C (72.5°F), and then it stops. * The thermostat shows me it is currently 22.5°C, but refuses to continue heating to 26°C. I just...
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