In some buildings, heat supply consists of only one type of energy, for example, the building may be heated with district heating, direct electricity, pellet boiler or electric boiler. In that case, the heat supply is seen as one single item, which is then divided into how much goes to room heating, ventilation and domestic hot water.
A common case is that the building has a heat pump, and then the heat supply may consist of several types of energy. The heat pump, is then a base load and some other type of energy accounts for any peak energy when the heat pump is not able to cover the entire heat demand.
In the case where we have a heat pump, the item "Heat supply" means the actual peak energy that has been supplied. The heat energy delivered by the heat pump is referred to in BIM Energy as “Heat supply from the heat pump” and in VIP-Energy as “Condenser heat”. Under both the peak heat and the heat energy from the heat pump, the amount that goes to room heating, ventilation and domestic hot water is reported.
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