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Boiler Size Formula:
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The Electric Boiler Size Calculator helps determine the appropriate kilowatt (kW) rating needed for an electric boiler to heat a specific volume of water by a certain temperature difference within a given time frame.
The calculator uses the boiler size formula:
Where:
Explanation: The formula calculates the power required to heat water based on the principle that 1 kW can raise the temperature of 860 liters of water by 1°C in 1 hour.
Details: Correct boiler sizing is crucial for energy efficiency, cost savings, and optimal performance. An undersized boiler won't meet heating demands, while an oversized one wastes energy and increases operating costs.
Tips: Enter the water volume in liters, desired temperature increase in °C, and the time available for heating in hours. All values must be positive numbers.
Q1: Why is 0.00116 used in the formula?
A: This constant represents the specific heat capacity of water (4.186 kJ/kg°C) converted to kW units for practical calculation.
Q2: What is a typical boiler size for residential use?
A: Residential electric boilers typically range from 3-15 kW depending on the house size and hot water demand.
Q3: How does insulation affect boiler sizing?
A: Better insulation reduces heat loss, which may allow for a smaller boiler size. Always consider insulation quality in final sizing decisions.
Q4: Can this calculator be used for commercial applications?
A: Yes, the same formula applies, but commercial systems often require additional factors like simultaneous demand and safety margins.
Q5: What if I need to heat water faster?
A: Reducing the heating time in the calculation will result in a higher kW requirement, meaning you'll need a more powerful boiler.