1. What is Boiler Size Calculation?

Boiler size calculation determines the appropriate capacity of a boiler needed to meet both space heating and domestic hot water requirements. Proper sizing ensures efficient operation and prevents energy waste.

2. How Does the Calculator Work?

The calculator uses the boiler size equation:

Where:

• \( Heat\_loss \) — Heat loss of the building (BTU/hr)
• \( Hot\_water\_demand \) — Domestic hot water demand (BTU/hr)

Explanation: The total boiler capacity must be sufficient to cover both the building's heat loss and the hot water requirements simultaneously.

3. Importance of Proper Boiler Sizing

Details: Correct boiler sizing is crucial for energy efficiency, comfort, and equipment longevity. Oversized boilers cycle more frequently, reducing efficiency, while undersized boilers can't meet demand.

4. Using the Calculator

Tips: Enter accurate heat loss calculations (from a heat loss analysis) and realistic hot water demand estimates. Both values must be in BTU/hr and greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: How do I determine my building's heat loss?
A: Heat loss should be calculated by a professional using factors like insulation levels, window types, and local climate conditions.

Q2: What affects hot water demand?
A: Number of occupants, fixture types, and usage patterns all influence hot water demand.

Q3: Should I add a safety factor?
A: Modern boilers are efficient at partial load, so exact sizing is better than arbitrarily adding capacity.

Q4: What about combi boilers?
A: Combination boilers must be sized primarily for hot water demand, as this typically exceeds space heating needs.

Q5: How does altitude affect boiler sizing?
A: At higher altitudes, boiler capacity decreases - consult manufacturer data for altitude correction factors.