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  • FIRST POST
    • Parkerr12
    • By Parkerr12 18th May 17, 3:08 PM
    • 1Posts
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    Parkerr12
    Air to water heat pump systems
    • #1
    • 18th May 17, 3:08 PM
    Air to water heat pump systems 18th May 17 at 3:08 PM
    We are looking at changing our heating system currently economy 7 storage heaters which are not very effective, also some radiators run from a woodburner. As we do not have mains gas in our area we are looking at alternatives, specifically heating we can switch on as and when required. Looking at lpg gas, and air to water pumps, there are incentives with potential income from air source heat pumps, we would not be interested in the air to air as too disruptive to install.
    Does anyone have any experience of air to water pump system, I have heard larger radiators are needed ?
Page 1
    • lovesgshp
    • By lovesgshp 18th May 17, 4:24 PM
    • 1,241 Posts
    • 694 Thanks
    lovesgshp
    • #2
    • 18th May 17, 4:24 PM
    • #2
    • 18th May 17, 4:24 PM
    If you are looking at a air/water heat pump, then it is not designed to be switched on and off as needed. There are timers, but, these are meant to just reduce flow temperatures (max about 4C for rads) and not for room temps.
    Not always required to change existing rads, but if you are taking out storage heaters then maybe a good idea in those areas. You could replace the storage units with fan coils, but these can be more expensive than rads.
    As Manuel says in Fawlty Towers: " I Know Nothing"
    • Cardew
    • By Cardew 18th May 17, 4:44 PM
    • 26,577 Posts
    • 12,808 Thanks
    Cardew
    • #3
    • 18th May 17, 4:44 PM
    • #3
    • 18th May 17, 4:44 PM
    Welcome to the forum.

    There are lots of threads on ASHPs on this forum. In particular this thread gives the links to some trials carried out on behalf of the Energy Saving Trust.

    http://forums.moneysavingexpert.com/showthread.php?t=2968958&highlight=should+must+do+ better
    • matelodave
    • By matelodave 20th May 17, 4:38 PM
    • 2,840 Posts
    • 1,603 Thanks
    matelodave
    • #4
    • 20th May 17, 4:38 PM
    • #4
    • 20th May 17, 4:38 PM
    Yes, I've got one and had it for nearly seven years and I'm very happy with it BUT if you are seriously considering one then make sure you know how they work and how to operate them. They do not work like a conventional system and getting it wrong will cost you a lot of money and you'll still be cold.

    They are not suitable to just turn on and off, they work best when gently idling witha flow temperature of around 35 degrees C. For every degree above that it will cost another 2.5% or thereabouts on your leccy bill so you need radiators that are capable of working at low temperatures. Likewise you shouldn't turn it off overnight or during the day, just turn the stats down a couple of degrees as it will take a long time to reheat the place.

    Our system will take a couple of days to get the house up to temperature from stone cold unless I tweak the temperature control.Once set up though we've got nice even heat throughout the bungalow.

    You need to ensure that the whole system is designed properly and not just bung onto the end of the radiators that you've already got. We installed it in conjunction with an overlay underfloor wet system but an alternative is for fan convectors which are quite effective with low flow temperatures.

    I've got some info on my set up if you want to PM me
    Love makes the world go round - beer make it go round even faster
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