prEN 15450

Heating systems in buildings - Design of heat pump heating systems prEN 15450

Publication date:   Jan 29, 2026

Scope

This document specifies design criteria for heating and cooling systems in buildings using electrically driven heat pumps for heating and cooling alone or in combination with other heat generators. The heat pump systems considered in this document (source system/sink system) are listed in Table 1. For cooling purposes, energy source and energy sink can be reversed.
This document also applies to other energy sources such as wastewater, massive absorbers, ice storage systems, as well as heat pump systems using more than one energy source.
This document takes into account the heating requirements of attached systems (e.g. domestic hot water) in the design of the heat supply but does not cover the design of these systems. This document covers the aspects dealing with the heat pump, the interface with the heat distribution system and heat emission system, the control of the whole system and the aspects dealing with energy source of the system.
Design criteria for reversible heat pump systems for heating and cooling are also included in this document.
Table 1 - Heat pump systems used for heating (within the scope)