1. What is Heat Pump Sizing?

Heat pump sizing calculates the required capacity (in kW) of an air source heat pump to efficiently heat a UK home. Proper sizing is crucial for energy efficiency and optimal performance.

2. How Does the Calculator Work?

The calculator uses the standard sizing formula:

Where:

• \( Area \) — Total floor area of the property in square meters
• \( Factor \) — Heat loss factor (typically 50-100 W/m² for UK homes)

Explanation: The calculation estimates the heat energy needed to maintain comfortable temperatures based on your home's size and insulation quality.

3. Importance of Correct Sizing

Details: An undersized heat pump will struggle to heat your home, while an oversized one will cycle on/off frequently, reducing efficiency and lifespan. Proper sizing ensures optimal performance and energy savings.

4. Using the Calculator

Tips:

• Measure your total heated floor area (excluding garages/outbuildings)
• Choose heat loss factor: 50-65 for well-insulated, 65-85 for average, 85-100+ for poorly insulated homes
• For listed buildings or very old properties, consult a professional

5. Frequently Asked Questions (FAQ)

Q1: What's a typical heat pump size for UK homes?
A: Most UK homes need 5-15kW systems. A 3-bed semi might need 5-8kW, while a 4-bed detached may require 10-15kW.

Q2: Should I get a professional assessment?
A: Yes, this calculator provides an estimate only. A professional heat loss survey is recommended before purchase.

Q3: Does this account for hot water needs?
A: No, this calculates space heating only. Add 1-2kW for domestic hot water requirements.

Q4: What about climate variations in the UK?
A: The calculation already accounts for typical UK climate. Colder Scottish areas might need slightly higher factors.

Q5: How does insulation affect sizing?
A: Better insulation reduces the required size. Improving insulation before installation can allow for a smaller, cheaper system.