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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

PLEASE NOTE: A download link for Volume 1 will be sent to you by email and Volume 2 will be sent to you by post as a book.

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    • CommentAuthorBoreas
    • CommentTimeDec 3rd 2018
    Hi Guys,
    I have two simple heating circuits running off a thermal store; one is the UFH and the other a towel rail then radiator (in series). At present, the control for the pumps running is locally on the store and they are bimetallic thermostats (the old kind) which make the pumps run too long which is a waste of power and hot water (and cash).
    I don't mind the set up as is as it's simple but need a much more accurate switch on/off stat. For example, let's say the rads are set to come on when the store temp reaches 40 degrees. I need a thermostat which measures when the water is drops below this temp (or whatever is set) that makes the pump stop running and not at say 30 degrees. The units must have probes which slot into tubes in the store. There is no control in any rooms, like I said before only local on the store.
    Looking forward to your comments.

    Thank you , Nick.:surprised:
    • CommentTimeDec 3rd 2018
    So you heat the thermal store up with something. That makes the heating pumps come on and they run until the thermal store is cool again?
    • CommentAuthorbhommels
    • CommentTimeDec 3rd 2018
    An NTC based thermostat should be a lot more accurate and have far less hysteresis than a bimetal. Not sure about brands, types, etc, I reckon there must be an analog version with tunable upper/lower temperature settings somewhere.
    A digital solution would be even more accurate & versatile but probably OTT.
    I use this one


    Adjustable hysteresis between 0.5 to 5 deg with a factory set at 3 deg. It has the option of a built in sensor or an external sensor. For my use the thermostat programmer unit is in the boiler and thermal store (TS) room and the external sensor in in the guest house. There are no batteries, it runs off the mains and seems unaffected by power cuts of 8 hours. The sensor is small enough to fit into sensor tubes of a TS.

    A potential advantage for you could be that the thermostat unit could be mounted somewhere convenient (not next to the TS) so that the temp reading of the TS would be remotely visible.
    • CommentAuthorphiledge
    • CommentTimeDec 3rd 2018
    If you're concerned about wasting power/ hotwater/cash, youd be better putting controls in the room(s). Theres no point in even starting the pump if the room(s) dont need heat.
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