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thermostats

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. S

    Why do some Immersion Heaters have twin thermostats?

    Thank's in advance!
  2. M

    Programmable room thermostats

    I think I have a problem with my ageing Drayton RTS5 manual thermostat It's connected to a Drayton timeswitch/Potterton System boiler. Basically the boiler + CH is just on all the time regardless of the thermostats temperature setting. I've reset the timeswitch and the room stat appears to be...
  3. B

    Wireless programmable thermostats

    Central heating system has never had a room thermostat just relied on thermostatic radiator valves. Would like to install a wireless programmable thermostat, any one had any experience of the Salus st620rf? Saw one in a house over the weekend and it looked impressive but only been operating a...
  4. D

    Underfloor heating with Air Source - No room thermostats?

    MY friend has an underfloor heating system fed from an air source heat pump, installed a couple of years ago. It's used to heat an old, large farmhouse. From what I can see there are no room thermostats installed. He has been told to regulate the temperature in the house by adjusting the...
  5. V

    3 zones or new Honeywell EvoHome

    Morning all I've been getting some great advice about controlling the heating system in our house which we're renovating at the minute. http://www.ukplumbersforums.co.uk/central-heating-forum/22998-controlling-3-heating-zones.html Having been looking around at the various options for...
  6. F

    uponor ufh thermostats

    Hi Can I use ant type of thermostat to control the actuators on my uponor ufh I want to use an lcd display one rather than the thumb wheel ones supplied in the kits Thanks Tony
  7. V

    Controlling 3 heating zones

    Good evening everyone We're just starting work on the heating part of a major house renovation. Some of this project involves splitting the existing Y plan system into 3 separate heating zones plus an ecocent cylinder for hot water. Currently the heating and water are controlled by a 2...
  8. F

    Wireless Programmer for Remeha 28c - Suggestions

    Can anyone give me some suggestions on a wireless programmer/thermostat for a Remaha 28c, i have heard the best ones are opentherm(modulating ones). And can i fit myself without voiding warrenty on boiler. I was looking at the Remeha iSense RF but its not available in uk only from holland ( if...
  9. I

    Wireless thermostats for Worcester Bosch 30CDi

    I've been using a Digistat Optimiser RF10 wireless thermostat with my Greenstar 30CDi for the last 3 years. It's one of the older models with a square transmitter unit. The transmitter has stopped working (I think) - i.e. it will no longer connect with the receiver. Obviously I'm a bit...
  10. M

    wireless thermostats etc.

    Hi Just had a Worcester 30Si fitted and got a wireless digistat with it. A couple of silly beginner questions: Can I buy another digistat and link it to my boiler i.e. can I have one upstairs and one downstairs? I see there's something called a 'digistat optimiser' available as well - how is...
  11. A

    Cautious custards!

    Guy wants two unvented tanks because he does not want to loose any pressure. just wondering do i need to use 2 EVs and 2 linestrainers and do tank discharges need separte outlets? Also any ideas on how to wire either 2 twoport valves and tank thermostats or just 1 two port valve and 2 tank...
  12. Z

    Thermostats don't seem to be controlling wet undefloor heating system

    Got a wet based underfloor heating system that has been installed but. The guy who installed it for me is on holiday for 2 weeks and I was wondering if the problem is a simple one to solve? The problem is as follows: The thermostats do not seem to be regulating the heat in any of the...
  13. R

    Wireless Room Thermostats

    Hi chaps, I've been asked to fit a wireless room stat for a customer. I've not done one of these before. Are they easy to set-up and get going?? Cheers rob
  14. V

    Immersion Heater thermostats probs

    Hello everyone , In the last few weeks iI have replaced immersion heaters for 2 customers and both of them have tripped out the safety cut out device . I had set them to 65 o C . I just lowered them to 60o & so far they havent cut out again . But they shoulnt cut really till the temp' reachs...
  15. B

    radiator thermostats

    hi, Can anyone help me with the following. I cannot seem to get my Radiator Thermostat working. When I put the Honeywell white with black top button onto the valve , and turn it to cold, the radiator still stays hot. What have I done wrong? Bill
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