Heat Pump Design

Heat Pump Sizing Calculator

Detailed heat loss calculation based on your building materials, dimensions, and insulation. Find the right heat pump size for your property.

Property Details

EPC Rating (for quick estimate)

Property Type

Property Era

Floor Area (m²)

Number of Storeys

Temperature Settings

Design Outside Temperature (°C) UK average: -1°C to -2°C

Desired Room Temperature (°C)

Target Flow Temperature (°C) Lower = more efficient (aim for 45-50°C)

Hot Water Temperature (°C)

Building Elements - U-Values & Areas

WALLS

Wall Type

Wall U-Value (W/m²K)

Total Wall Area (m²)

Wall Insulation Status

ROOF & FLOOR

Roof Type

Roof U-Value (W/m²K)

Roof Area (m²)

Floor Type

Floor U-Value (W/m²K)

Floor Area (m²)

Windows & Doors

Window Type

Window U-Value (W/m²K)

Total Window Area (m²)

Window Orientation

Door Area (m²)

Ventilation & Air Tightness

Air Changes per Hour (ACH) Typical: 0.3-0.5 (good), 0.8-1.0 (average)

Mechanical Ventilation?

MVHR Efficiency (%)

Heat Pump Sizing Calculator

Property Details

Temperature Settings

Building Elements - U-Values & Areas

WALLS

ROOF & FLOOR

Windows & Doors

Ventilation & Air Tightness

Heat Loss Calculation Results

Total Heat Loss

Heat Loss Density

Recommended HP Size

Annual Heating Demand

Heat Loss Breakdown

Impact of Improvements

Recommendations