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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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General: WWHRS

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    • CommentAuthorajw01
    • CommentTimeFeb 3rd 2021
     
    Does any one know much about Waste Water Heat Recovery for Showers?

    There are some very expensive solutions out there that don't provide a viable ROI.

    Has anyone tried a DIY solution and any suggestions if this is viable?

    Many Thanks
    • CommentAuthortony
    • CommentTimeFeb 3rd 2021
     
    DIY can be OK but very marginal, messy and nearly always heavily against water regulations.

    Most of the heat is lost to the house before it goes down the plug hole

    simplest is to fill the floor or tray to safe depth till it is cool then pull the plug or weir tube
    • CommentAuthorphiledge
    • CommentTimeFeb 3rd 2021
     
    Our ensuite, on an outside wall, has a SVP for the toilet but weve run the shower waste to a SVP in the centre of the house. Gives us about 5 metres of waste, 2 metres of SVP within the house and 5 metres of drain under the house to give up as much heat as it can. No idea how much heat we recover but gotta be better than going straight outside??
    • CommentAuthorjms452
    • CommentTimeFeb 6th 2021
     
    We considered one of these which have a vented twin wall construction between waste and fresh but they need to be vertical so were incompatible with a downstairs bathroom.

    https://powerpipehr.co.uk/

    The are a copper downpipe with separate copper tube spiralling upwards around the outside.

    Seems like win as even if much of the heat is lost to the room before the water goes down the drain in winter the incoming water is 5-10C.

    Was less keen on the budget tray type wwhr devices given the amount hair I have to fish out of the waste monthly!
    • CommentAuthorajw01
    • CommentTimeFeb 8th 2021
     
    I had seen something like this
    https://recoupwwhrs.co.uk/products/easyfit/
    which offers over 40% heat recovery - which then feeds back to the cold supply of the shower - reducung the hot water needed to maintain the 35-40degree temperature of the running shower.
    its got to be a winner with the number of showers we take on a daily basis but just expensive to buy.

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