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  • FIRST POST
    • want2bmortgage3
    • By want2bmortgage3 23rd Mar 08, 11:33 PM
    • 1,944Posts
    • 416Thanks
    want2bmortgage3
    condensing combi boiler temperature setting
    • #1
    • 23rd Mar 08, 11:33 PM
    condensing combi boiler temperature setting 23rd Mar 08 at 11:33 PM
    well i can control the hot water and central heating temp's on my boilers control panel

    i am happy with the water at 50 degrees as its just hot enough for a hot bath/shower, but not scalding

    however, i'm unsure what to set the central heating to. ive tried 65 and 70. but my main concern is whats best to save money? is it better to blast it out hot for a shorter time, or have it on longer at a lower temperature?

    also i have thermo valves on the radiators is it worth using these or have them all fully open ? if someone knows the most efficient way of controlling heating id love to know. for note, i dont have any room thermostats, just a heating timer (3 periods a day) and the rad valves.
Page 1
    • Canucklehead
    • By Canucklehead 24th Mar 08, 8:07 AM
    • 6,264 Posts
    • 3,371 Thanks
    Canucklehead
    • #2
    • 24th Mar 08, 8:07 AM
    • #2
    • 24th Mar 08, 8:07 AM
    Hi

    As an installer I am working to this.... http://www.energysavingtrust.org.uk/home_improvements/heating_and_hot_water/heating_controls

    You need a room stat ideally.How long you run the system for depends on your use of the house , are you home all day or out? If you're not home all day turn it off.

    If you have young children at home or the chance of an older person falling and getting stuck next to or against a rad then a lower temperature would be better. It will take longer for the house to heat up from cold though.


    Corgi Guy.
    Ask to see CIPHE (Chartered Institute of Plumbing & Heating Engineering)
    • want2bmortgage3
    • By want2bmortgage3 24th Mar 08, 10:21 AM
    • 1,944 Posts
    • 416 Thanks
    want2bmortgage3
    • #3
    • 24th Mar 08, 10:21 AM
    • #3
    • 24th Mar 08, 10:21 AM
    thanks for the reply. good article there, people need to know about this stuff. i'm after a little more detail though. i've currently got a basic timer connected to the boiler, drayton something. how easily could i fit a room thermostat? as you said it would be the best solution.

    say i did fit one, i'd still be asking whether its more efficient to have the heating set at say 80c to bring the room up to temp quickly, or say 65c but take a lot longer?
    • want2bmortgage3
    • By want2bmortgage3 24th Mar 08, 12:35 PM
    • 1,944 Posts
    • 416 Thanks
    want2bmortgage3
    • #4
    • 24th Mar 08, 12:35 PM
    • #4
    • 24th Mar 08, 12:35 PM
    for example, say you've got your room thermostat set to 20c, then what is more efficient with all rad valves fully open:

    - boiler sending water out at 80c and needing less time to reach the 20c
    - boiler at a lower 65c but needing longer to get up to temp?
    • Canucklehead
    • By Canucklehead 24th Mar 08, 4:09 PM
    • 6,264 Posts
    • 3,371 Thanks
    Canucklehead
    • #5
    • 24th Mar 08, 4:09 PM
    • #5
    • 24th Mar 08, 4:09 PM
    .

    If you have young children at home or the chance of an older person falling and getting stuck next to or against a rad then a lower temperature would be better. It will take longer for the house to heat up from cold though.
    I thought that kind of answered your question . Yes run the boiler at near max . Turn the TRVs down to make the room comfortable for you.

    I go to quite a few houses where all the TRVs are on max and no one seems to worry about it:confused:
    Ask to see CIPHE (Chartered Institute of Plumbing & Heating Engineering)
    • want2bmortgage3
    • By want2bmortgage3 26th Mar 08, 3:44 PM
    • 1,944 Posts
    • 416 Thanks
    want2bmortgage3
    • #6
    • 26th Mar 08, 3:44 PM
    • #6
    • 26th Mar 08, 3:44 PM
    hi canuckel
    thanks or your reply, i just wonder though that turning up the boiler then turning the rads down with the valves might cost more due to the gas needed to keep the boiler at max temp
  • jteez
    • #7
    • 31st Jan 12, 12:58 PM
    • #7
    • 31st Jan 12, 12:58 PM
    I know this is an old thread but it is a useful one nevertheless so...

    Basically you won't get a simple answer because it's complex and there's no simple answer.

    I think superficially as Canucklehead said, the boiler is designed to run most efficiently at it's maximum tempurature. So there is your answer. The overhead of having the boiler up high I assume is out weighed by the benefits of radiator efficiency, etc....

    However if it is a condensing boiler its important to ensure that the flow/return (at the boiler) doesn't exceed 20degC so that the boiler can maintain it's own maximum efficiency.

    If it's a modulating boiler supporting openTherm, make sure you get an openTherm thermostat which not only turns the boiler on and off but also controls the boilers temperature to maintain max efficiency.

    Modern wireless room thermostats are very easy to fit, if you are 'competent'... These still need a device wired close to the boiler. Many boilers are wired externally so no need to open the casing. However there is a risk of knackering the boiler computer if you wire it wrong.

    With a thermostat you could continue to use the boilers timer, and have an additional temperature control (just to adjust weather you're sitting around and want it warmer or doing the cleaning and want it a little cooler).

    But there are many ways to boost the efficiency of your system. But absolutely best is dealing with drafts (even just cracks in ceiling/wall plaster - easiest to test on cold windy days)

    Multiple zones (separate bedrooms/living rooms) are great and relatively simple to install.

    However if you're not sure about what you're doing, definitely best to get a gas safe central heating specialist. Though make sure your talk to the about efficiency to gauge their abilities because sadly as with every industry (not picking on plumbers) there are many people that just don't really care about what they do.

    What temperatures did you decide on in the end, or have you upgraded to wet solar in the meant time
  • lanto
    • #8
    • 6th Mar 12, 5:15 PM
    • #8
    • 6th Mar 12, 5:15 PM
    Thanks jteez. Even though it is an old post people like me are still looking for good answers, yours has enough tech speak for me understand.
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