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New DHW system

  • 09-05-2014 10:34am
    #1
    BobMcBob
    Registered Users, Registered Users 2 Posts: 63 ✭✭


    I have a new build that we will be sending out tender documents soon. I have ASHP with underfloor heating system specced by one of the HP companies with a 300L tank.
    Now I need to think about the DHW side of things. There will be 4 bathrooms (4 showers, 1 bath) in the house.
    I don't think the water pressure / flow is good enough to utilise a mains pressure system. My own thoughts were

    Breaker tank ~500L with submersible pump for the power showers, maybe a heat exchange system (just for the legionella - heating the tank to 60c isn't efficient for a heat pump).

    Re-circulation system (time / temp and presence controlled) with highly insulated pipe work. The en-suite is at the opposite end of the house to the hot water cylinder, have same issue in the house I am renting takes 1 1/2 to 2 minutes to reach the shower. Don't like pouring cooled hot water down the sink.

    Is this a sensible / workable solution? I am not a plumber so apologies far any silly errors. I was planning to give the basic outline / concept of what I wanted and then pin down the details with the builder / plumber after the tender.

    Lastly the water hardness from the council is 80 - 229 mg /ml (average 158mg /ml) so I am not sure if I need to have a water softener, and how that would be incorporated.

    Any pointers / help much appreciated

    BmcB


Comments

  • #2
    shane 007
    Closed Accounts Posts: 914 ✭✭✭shane 007


    Why do you not have the heat pump looking after your dhw?


  • #3
    BobMcBob
    Registered Users, Registered Users 2 Posts: 63 ✭✭BobMcBob


    The heat pump will be providing the hot water as well as the heating. It is the distribution etc of the hot water that I want to get sorted. The system design from the heat pump installer has the underfloor system and the hot water cylinder but stops at that.

    BmB


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