The domestic_hot_water element is a child of the systems element. You can only submit one instance of the domestic_hot_water element.


  • The category element can only be set to combined if the heating/type is boiler and the boiler provides the domestic hot water.

  • The type element can only be set to indirect or tankless_coil if category is set to combined.

  • The fuel_primary, efficiency_method and year elements are only used if type is set to storage or heat_pump.

  • The type element determines possible values and ranges of the other elements in domestic_hot_water as follows