1. What is Heat Pump Sizing?

Heat pump sizing calculates the appropriate capacity (in kW) needed to efficiently heat a UK home based on floor area and heat loss characteristics. Proper sizing ensures optimal performance and energy efficiency.

2. How Does the Calculator Work?

The calculator uses the standard UK heat pump sizing formula:

Where:

• \( Area \) — Total floor area in square meters
• \( Factor \) — Heat loss factor (typically 50-100 W/m²)
• \( kW \) — Recommended heat pump capacity

Explanation: The calculation accounts for the building's heat loss characteristics, with higher factors used for less insulated properties.

3. Importance of Proper Sizing

Details: Correct heat pump sizing is crucial for energy efficiency, system longevity, and maintaining comfortable indoor temperatures. Oversizing leads to short cycling, while undersizing results in inadequate heating.

4. Using the Calculator

Tips: Measure your home's total heated floor area. Select heat loss factor based on insulation: 50-60 (well insulated), 70-80 (average), 90-100 (poor insulation).

5. Frequently Asked Questions (FAQ)

Q1: What heat loss factor should I use?
A: New builds: 50-60 W/m². Modern insulated homes: 60-70. Older homes: 70-90. Poorly insulated: 90-100.

Q2: Does this account for hot water?
A: No, this calculates space heating only. Add 1-2 kW for domestic hot water needs.

Q3: What about room-by-room calculations?
A: For precise sizing, a professional heat loss survey is recommended.

Q4: How does climate affect sizing?
A: This calculator uses standard UK climate factors. Colder regions may need slightly higher capacity.

Q5: What's the typical range for UK homes?
A: Most UK homes require 5-15 kW heat pumps, depending on size and insulation.