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Post by mark on Apr 30, 2013 1:32:38 GMT -5
Hello fellow forumites,
This is my first post and I hope its not a silly one.
I was just wondering if leaving the boiler's hot water and central heating mode on a timed setting of 24 hours / all day counts towards your gas bill during periods when you're not actually running the hot water or turning the thermostat on?
Cheers,
Mark
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Post by Mike the Boilerman on Apr 30, 2013 13:51:45 GMT -5
Mark, No such thing as a silly question, unless you've been given the answer already! Even so, I'm not sure I quite understand your question! You only pay for the gas the boiler burns. I have to say I'm not fully conversant with the way the programmer operates, but I think that when the timer is in it's OFF periods the boiler will burn no gas. This means any heat you use running the hot water will be replaced later, when the timer comes back ON, so you'll burn the gas anyway, just later in the day. I think the CH won't come ON at all with the timer in an CH OFF period, so the boiler will use no gas unless the HW happens to be ON. I expect you are still confused...  Mike |
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Post by northpole on May 1, 2013 4:22:59 GMT -5
Mark,
There is a school of thought that it is better to keep the water in the tank hot all the time by having the DHW timer on 24 hours, rather than letting it cool down while the timer is OFF and heating it up again when it's ON, as Mike says. Also the boiler parts (particularly pipe joints) may be less stressed by keeping them hot continuously, instead of subjecting them to alternating cool and hot conditions. The only way I can suggest to see how your gas bill is affected is to try leaving the boiler on continuously for say two weeks, and then another two weeks letting it switch off at night, noting the meter readings for both periods. Of course this assumes the weather and your DHW use is similar for the entire period!
In my case the boiler is in a cupboard adjoining the main bedroom, so no way can I put up with the boiler firing up during the night!
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Post by Mike the Boilerman on May 6, 2013 6:59:14 GMT -5
This raises another point. I notice that regularly turning one's Powermax OFF and allowing it to cool seems to be associated with fracturing of the gas-to-water heat exchanger tubes. This is the fault where water accumulates in the sump and the boiler makes a noise like a dishwasher when attempting to start.
When I encounter this fault, it often turns out the user is in the habit of turning his/her Powermax OFF when they don't need hot water and firing it up only when actually needed. This seems to be a bad habit if you want your Powermax to last a long time. I think northpole's point about avoiding heat-change-stress is a good one. I suspect the heat-stress induced by repeatedly heating a Powermax from cold leads to work-hardening of the copper tubes and their eventual fracture.
Mike
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