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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.

Buy individually or both books together. Delivery is free!

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    • CommentAuthorcjard
    • CommentTimeJan 13th 2016 edited
    I like the idea that there's a gas boiler built into them, and the controller knows when to use it, versus using the ASHP part .. the only bit I can't quite understand is why it's built into the indoor unit. If it were in the outdoor unit, it would do away with the flue, it could be a tiny boiler, and it could heat the refrigerant

    SInce finding this out, I can't help but think it's not so much a unique selling point after all - why bother integrating it into the indoor unit when the unit could simply be made smaller, keep the intelligent control of ashp/boiler mode and have a switched/voltfree connection to command a separate boiler?
    • CommentAuthorringi
    • CommentTimeJan 13th 2016
    I think they for example they use the ASHP to preheat the incoming cold water and then gas boiler to top it up to give the DHW.

    It seems to be able to run UFH and Radiators, if so you may only need the "gas boast" for the radiators.

    However putting the boiler in the outside unit would allow very good condensing!

    Overall I don't see much point in the system, as it is hard to beat a simple gas boiler if you have mains gas.
    • CommentAuthorcjard
    • CommentTimeJan 14th 2016
    It's convertible to LPG (and promoted by Calor) for those of us not on mains gas ;)
    • CommentAuthorringi
    • CommentTimeJan 14th 2016
    Given how much more LPG costs the mains gas, it may make sense.
    • CommentAuthorcjard
    • CommentTimeJan 15th 2016
    It's one thing I didn't quite get about the Calor offering - the install price for the pump also includes the LPG tank and all its connectivity and they'll even bury it if the customer digs the hole. I got to wondering, if the pump is correctly sized for the house, it'll use the gas next to never so one fill up will go a very long way. For a gas company, unless there's some rental element to the tank and it not just be built into the litre price of the gas, this action must be a foot-shoot in some regards..
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