1. What is a Heat Pump Size Calculator UK?

Definition: This calculator estimates the required size of a heat pump for UK properties based on heat loss and coefficient of performance (COP).

Purpose: It helps homeowners and installers determine the appropriate heat pump capacity for efficient heating.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( \text{Size} \) — Required heat pump size (kW)
• \( \text{Heat Loss} \) — Building heat loss (kW)
• \( \text{COP} \) — Coefficient of Performance (dimensionless)

Explanation: The heat loss is divided by the COP to determine the heat pump size needed to maintain comfortable temperatures.

3. Importance of Correct Heat Pump Sizing

Details: Proper sizing ensures efficient operation, prevents short cycling, and maximizes the heat pump's lifespan while maintaining comfort.

4. Using the Calculator

Tips: Enter the building's heat loss in kW and the heat pump's 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 loss?
A: Conduct a professional heat loss survey or use simplified calculators based on property size, insulation, and location.

Q2: What's a typical COP value for UK heat pumps?
A: Most modern heat pumps have a COP between 3.0-4.0 under UK conditions, with 3.5 being a good average.

Q3: Why is sizing important for heat pumps?
A: Unlike boilers, heat pumps work most efficiently when correctly sized - oversized units cycle frequently and lose efficiency.

Q4: Should I add a buffer to the calculated size?
A: It's common to add 10-20% capacity for extremely cold days, but consult with a professional for your specific situation.

Q5: Does this account for domestic hot water needs?
A: No, this calculates space heating requirements only. Additional capacity may be needed for hot water production.