1. What is a Heat Pump Size Calculator for UK?

Definition: This calculator determines the appropriate size of a heat pump needed for a property based on the heat load and the system's coefficient of performance (COP).

Purpose: It helps homeowners and installers select the correctly sized heat pump for efficient operation in UK homes.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• Size — Required heat pump size (kW)
• Load — Building's heat demand (kW)
• COP — Coefficient of Performance (dimensionless)

Explanation: The heat load is divided by the COP to determine the heat pump size needed to meet the building's heating requirements efficiently.

3. Importance of Correct Heat Pump Sizing

Details: Proper sizing ensures optimal efficiency, prevents short cycling, maintains comfort, and extends equipment life. Undersized units won't meet demand, while oversized units are less efficient.

4. Using the Calculator

Tips: Enter the building's heat load in kW (from a heat loss calculation) and the expected COP (default 3.5 for UK conditions). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: How do I find my building's heat load?
A: A professional heat loss survey is most accurate, or use our Heat Load Calculator for an estimate.

Q2: What's a typical COP for UK heat pumps?
A: Most modern heat pumps have a COP between 3.0-4.0 in UK winter conditions, but this varies by model and temperature.

Q3: Should I round up the calculated size?
A: Heat pumps come in fixed sizes, so round up to the nearest available unit size (3kW, 5kW, 7kW, etc.).

Q4: Does this account for hot water needs?
A: No, this calculates space heating only. Add 0.5-1kW to your total if the heat pump will also provide domestic hot water.

Q5: How does insulation affect the calculation?
A: Better insulation reduces the heat load, allowing for a smaller heat pump. Always use up-to-date heat loss figures.