A heat pump and a heat battery do different jobs. The pump moves heat into your home; the battery shifts heat from one time to another. They may be alternatives in a whole-home replacement plan, but they can also form part of the same system.
The short answer
If your aim is efficient ongoing heat generation, investigate a correctly designed heat pump. If your aim is storing heat made earlier, investigate thermal storage. Do not compare purchase prices until both proposals cover the same demand: space heating, hot water, or both.
Why efficiency language gets confusing
A heat pump can deliver more heat energy than the electrical energy it consumes because it moves heat from outside. A directly charged heat battery converts electricity to heat and stores it; its value may come from buying that electricity at a different time, not from multiplying it.
When they work together
Storage can give a heat pump somewhere to put heat when generation and demand do not line up. Whether that is useful depends on system volume, controls, tariff windows and the building's heat loss. Extra storage is not automatically an upgrade.
Ask the designer to show:
- the design heat loss and outdoor design temperature
- the expected flow temperature
- the hot-water demand assumption
- when the store charges and discharges
- how controls prevent expensive peak-time charging
When a direct comparison is fair
A whole-home heat battery designed to replace fossil-fuel heating can be compared with a heat pump proposal, provided both cover the same rooms and hot-water demand. A compact hot-water-only unit cannot.
Noise, outside space and emitters
An outdoor heat pump unit needs a suitable location and an acoustic assessment. A heat battery may avoid outdoor equipment, but whole-home electric charging can create a large electrical load. Radiators, pipework and the incoming supply still need checking.
Your next step
Get a room-by-room heat-loss calculation before choosing the appliance. It turns a vague product comparison into a system design with testable assumptions.
Sources
Primary and independent references checked by our editorial team.
- Energy storage options explained — Energy Saving Trust Checked 10 Nov 2026