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Conditions attached to heat pump grants with respect to the location of the DHW cylinder

  • 24-07-2023 12:23pm
    Registered Users Posts: 12,346 ✭✭✭✭

    Am told by a home owner who is now heating his garage to the tune of 3,000 kWh, that it was a condition of the HP grant that DHW cylinder could not be in an unheated space.

    Anyone know if this is correct?

    “I can’t pay my staff or mortgage with instagram likes”.


  • Registered Users Posts: 1,442 ✭✭✭DC999

    That's wrong looking at the specs from the SEAI site (though I don't have a HP): Domestic-Technical-Standards-and-Specifications.pdf ( There is a requirement for an insulated tank and piping. Maybe that got lost in translation somewhere. Makes nooooo sense to do what that person is doing.

    11 references to [domestic hot water] DHW in that doc.

    Pg 63: The [domestic hot water] DHW system must meet the following requirements: • The Hot Water Cylinder must meet the heat pump manufacturer’s requirements and the HPAI installation guidelines, with attention to the size of the heat exchanger and insulation; • Where present, pipework between the heat pump unit and the DHW cylinder must be insulated. • The system must be able to operate at temperatures preventing growth of Legionella. The heat pump must be able to supply hot water at 55⁰C and the supplementary hot water heater shall provide stored hot water at 60⁰C. See further guidance in standards, guidance and specifications documents; • Any other requirements under the regulations and standards listed in 6.9.4 Standards and Guidance documents.

  • Registered Users Posts: 12,346 ✭✭✭✭Calahonda52

    Thanks for digging this out, Help desk confirmed to home owner that the above is the case, with a somewhat lower BER because its in an unheated space but no reason to heat the garage.

    “I can’t pay my staff or mortgage with instagram likes”.