1. What is a Funded Air Source Heat Pump Calculator?

Definition: This calculator estimates the BTU output needed for air source heat pumps, particularly those eligible for government funding schemes.

Purpose: It helps homeowners and installers determine the appropriate heat pump size for government-funded projects.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( Q \) — BTU output required (BTU/h)
• \( A \) — Area to be heated (square feet)
• \( BTU/ft² \) — BTU per square foot requirement
• \( F \) — Adjustment factor for heat loss/insulation

Explanation: The area is multiplied by the BTU requirement per square foot, then adjusted by a factor accounting for insulation quality and climate.

3. Importance of Proper BTU Calculation

Details: Correct sizing ensures efficient operation, eligibility for funding schemes, and optimal performance of the heat pump system.

4. Using the Calculator

Tips: Enter the area in square feet, BTU per square foot (default 20 BTU/h·ft²), and adjustment factor (default 1.2). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the typical BTU/ft² for UK homes?
A: For well-insulated homes, 15-20 BTU/ft² is common. Older homes may need 25-30 BTU/ft².

Q2: How do I determine the factor (F)?
A: 1.0 for excellent insulation, 1.2 for average, 1.5 for poor insulation or colder climates.

Q3: Does this account for hot water needs?
A: No, this calculates space heating only. Add 20-30% for combined heating and hot water systems.

Q4: How does this relate to government funding?
A: Many funding schemes require properly sized systems. Oversizing can disqualify you from grants.

Q5: What's the conversion to kW?
A: Divide BTU/h by 3412 to get kW. A 12,000 BTU/h unit is about 3.5 kW.