How much power does my thermostat use?

Question

Hi,As winter seems to be arriving, I'm finally going to install myHoneywell CMT927 (wireless programmable thermostat) this weekend. I'man incorrigible miser when it comes to electricity (delighted now thatcarbon footprints are all the rage, I can hop on that bandwaggon, butmy stinginess has nothing as noble as environmental concern behindit). Anyway, I was going to just take the power feed from the same FCUas the boiler. But it has occurred to my parsimonious mind that it'spretty wasteful having the thermostat running for six months of theyear when it's not doing anything. So I'm inclined to give it its ownFCU so I can turn it off next spring, but does anyone have any ideahow much power these things actually use? The documentation that camewith it doesn't say, and I can't even find the thing on Honeywell'swebsite.Cheers!Martin

John · Accepted Answer

Get a life - there are more important things to worry about - like people buying stupid outside Xmas lights from China every year so they can enjoy Xmas.I guess the answer is 'negligible'

John Rumm · Answer

Strap it to your hot water cylinder so all that energy is not wasted in the summer.

<me9 · Answer

The electronics will take next to nothing. the main consumption will be the actual switching relay when actuated, This is unlikely to be more than a watt, and wouldn't be consuming power when the heating is off.

Dave Liquorice · Answer

The amount of energy you save by using it (sensibly) will far out strip the amount of energy it will consume for the entire year.

Even if you say it takes 5W (unlikely) thats only 43.8 kWhrs/year or about the same as an average boiler running for 2hrs.

John Rumm · Answer

If you use an impulse relay (as used by the battery powered prog stats) then you will only take power as it switches.My prog stat is about 4 years old, and still on its first set of AAs.

geoff · Answer

In message , Martin Pentreath  writesSwitch it off when you're not using it thenha ha

How much power does my thermostat use?

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