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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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How much power does my thermostat use?
Hi,
As winter seems to be arriving, I'm finally going to install my Honeywell CMT927 (wireless programmable thermostat) this weekend. I'm an incorrigible miser when it comes to electricity (delighted now that carbon footprints are all the rage, I can hop on that bandwaggon, but my stinginess has nothing as noble as environmental concern behind it). Anyway, I was going to just take the power feed from the same FCU as the boiler. But it has occurred to my parsimonious mind that it's pretty wasteful having the thermostat running for six months of the year when it's not doing anything. So I'm inclined to give it its own FCU so I can turn it off next spring, but does anyone have any idea how much power these things actually use? The documentation that came with it doesn't say, and I can't even find the thing on Honeywell's website. Cheers! Martin |
#2
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How much power does my thermostat use?
"Martin Pentreath" wrote in message ps.com... Hi, As winter seems to be arriving, I'm finally going to install my Honeywell CMT927 (wireless programmable thermostat) this weekend. I'm an incorrigible miser when it comes to electricity (delighted now that carbon footprints are all the rage, I can hop on that bandwaggon, but my stinginess has nothing as noble as environmental concern behind it). Anyway, I was going to just take the power feed from the same FCU as the boiler. But it has occurred to my parsimonious mind that it's pretty wasteful having the thermostat running for six months of the year when it's not doing anything. So I'm inclined to give it its own FCU so I can turn it off next spring, but does anyone have any idea how much power these things actually use? The documentation that came with it doesn't say, and I can't even find the thing on Honeywell's website. Cheers! Martin 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' |
#3
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How much power does my thermostat use?
Martin Pentreath wrote:
Hi, As winter seems to be arriving, I'm finally going to install my Honeywell CMT927 (wireless programmable thermostat) this weekend. I'm an incorrigible miser when it comes to electricity (delighted now that carbon footprints are all the rage, I can hop on that bandwaggon, but my stinginess has nothing as noble as environmental concern behind it). Anyway, I was going to just take the power feed from the same FCU as the boiler. But it has occurred to my parsimonious mind that it's pretty wasteful having the thermostat running for six months of the year when it's not doing anything. So I'm inclined to give it its own FCU so I can turn it off next spring, but does anyone have any idea how much power these things actually use? The documentation that came with it doesn't say, and I can't even find the thing on Honeywell's website. Cheers! Martin http://europe.hbc.honeywell.com/prod...6uk07r1006.pdf Back of a fag packet calcs suggest about £1.50 in electricity for the closed season, so an FCU would pay for itself in about 3 years. Well worth it, no? |
#4
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How much power does my thermostat use?
Martin Pentreath wrote:
as the boiler. But it has occurred to my parsimonious mind that it's pretty wasteful having the thermostat running for six months of the year when it's not doing anything. So I'm inclined to give it its own FCU so I can turn it off next spring, but does anyone have any idea how much power these things actually use? The documentation that came with it doesn't say, and I can't even find the thing on Honeywell's website. Strap it to your hot water cylinder so all that energy is not wasted in the summer. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#5
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How much power does my thermostat use?
Hi Rumble,
http://europe.hbc.honeywell.com/prod...6uk07r1006.pdf Thanks very much, that eluded me. It still doesn't give the power consumption though. Back of a fag packet calcs suggest about £1.50 in electricity for the closed season, so an FCU would pay for itself in about 3 years. This is based on an assumption that it uses 4 watts of power for six months I think. Might it not use more? Well worth it, no? Hmmmm, better than my fag-packet calculations for my loft insulation, and not such a dusty job ;-) |
#6
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How much power does my thermostat use?
Martin Pentreath wrote:
snip Back of a fag packet calcs suggest about £1.50 in electricity for the closed season, so an FCU would pay for itself in about 3 years. This is based on an assumption that it uses 4 watts of power for six months I think. Might it not use more? Something like that (I think I used 5W for 5 months). On balance though, I think 5W is very pessimistic for the radio receiver. With the radio receiver in standby, it could be using as little as 25mW, so assuming that the power supply is 50% efficient the unit would be pulling 50mW - and in this mode would run for about 2 years on a unit of electricity. |
#7
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How much power does my thermostat use?
On Thu, 27 Sep 2007 13:55:03 -0700, Martin Pentreath wrote:
I'm finally going to install my Honeywell CMT927 (wireless programmable thermostat) this weekend. I'm an incorrigible miser when it comes to electricity 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. -- Cheers Dave. pam is missing e-mail |
#8
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How much power does my thermostat use?
wrote:
On 28 Sep, Martin Pentreath wrote: This is based on an assumption that it uses 4 watts of power for six months I think. Might it not use more? 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. 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. -- Cheers, John. /================================================== ===============\ | Internode Ltd - http://www.internode.co.uk | |-----------------------------------------------------------------| | John Rumm - john(at)internode(dot)co(dot)uk | \================================================= ================/ |
#9
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How much power does my thermostat use?
In message om, Martin
Pentreath writes Hi, As winter seems to be arriving, I'm finally going to install my Honeywell CMT927 (wireless programmable thermostat) this weekend. I'm an incorrigible miser when it comes to electricity (delighted now that carbon footprints are all the rage, I can hop on that bandwaggon, but my stinginess has nothing as noble as environmental concern behind it). Anyway, I was going to just take the power feed from the same FCU as the boiler. But it has occurred to my parsimonious mind that it's pretty wasteful having the thermostat running for six months of the year when it's not doing anything. So I'm inclined to give it its own FCU so I can turn it off next spring, but does anyone have any idea how much power these things actually use? The documentation that came with it doesn't say, and I can't even find the thing on Honeywell's website. Switch it off when you're not using it then ha ha -- geoff |
#10
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How much power does my thermostat use?
In message om, Martin
Pentreath writes Hi Rumble, http://europe.hbc.honeywell.com/prod...6uk07r1006.pdf Thanks very much, that eluded me. It still doesn't give the power consumption though. Back of a fag packet calcs suggest about £1.50 in electricity for the closed season, so an FCU would pay for itself in about 3 years. This is based on an assumption that it uses 4 watts of power for six months I think. Might it not use more? You will have probably used more power using your computer to ask the question ... -- geoff |
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