Home Heat Demand Estimator

Enter some basic details about your home to get an indicative annual heat demand (kWh) and peak heat loss (kW). The kW figure points you towards the likely class of pellet appliance; the kWh figure can be used in the Running Cost Calculator. All assumptions shown below are editable, generic, indicative defaults, not a substitute for a full SAP assessment from a qualified energy assessor.

Property details

Total internal floor area (m²) Sum of all floors, e.g. a two-storey house might be 90 m² total.

Number of storeys

Property type

Approximate construction era

Current insulation

Loft insulation

Wall construction and insulation

Glazing

Edit the underlying assumptions (advanced)

Roof U-value (W/m²K)

Wall U-value (W/m²K)

Floor U-value (W/m²K)

Window U-value (W/m²K)

Glazed area (% of floor area)

Air changes per hour

Design temperature difference (K) Typical internal minus external design temperature, e.g. 21°C minus -3°C.

Annual degree days Indicative UK average figure. Replace with a local value if you have one.

Solar and internal gains offset (%)

These U-values, air change rate and degree-day figure are generic indicative defaults and are fully editable. They are not measured values for your property and should not be relied on for appliance sizing without a qualified check.

Home Heat Demand Estimator

Estimated results