An older home is not automatically unsuitable for a heat battery. It is less forgiving of assumptions about heat loss, emitter output and hidden services.
The short answer
Measure the building and system as they are. A room-by-room heat-loss calculation, radiator assessment, pipe survey and electrical inspection should come before a whole-home product choice.
Building fabric
Solid walls, suspended floors, air leakage and protected features can raise demand or limit retrofit options. Record insulation that is present and evidence for work hidden behind finishes.
Radiators and temperatures
Older radiators may have generous surface area, but condition, sludge and pipe size matter. Check output at the proposed flow temperature rather than assuming replacement.
Electrical history
Consumer units, earthing, cable routes and incoming supplies vary. A high-load heat store needs a proper assessment, not a visual guess.
Listed and conservation constraints
Internal work can still affect historic fabric, and external equipment or new routes may need consent. Check the building's status and local advice before destructive work.
Use staged improvements
Fabric repairs and controls may reduce required storage capacity. Model confirmed improvements separately from work that may never happen.
Your next step
Commission heat-loss and electrical checks before seeking a product-led quote. Give the designer drawings and records of planned fabric work.
Sources
Primary and independent references checked by our editorial team.
- Electrical safety: Approved Document P — GOV.UK Checked 10 Nov 2026
- Energy storage options explained — Energy Saving Trust Checked 10 Nov 2026