Jan 8, 2025 · Our Boiler Size Calculator uses the latest data to determine the ideal boiler size for your home based on factors like home size, climate zone, sun exposure and insulation condition. House size is just one factor in sizing a residential boiler.

Mar 14, 2025 · Boiler Size Calculator. Considering all of the above information, this quick, free, and easy-to-use calculator can estimate the boiler size needed for a property and advise an indicative cost. The calculator estimates the costs of installing a new boiler by making suggestions based on mid-range boilers and average installation costs.

Apr 30, 2019 · Properly sizing a boiler is accomplished by matching the heat output (BTUh) of the appliance with the home’s need for heat (and domestic hot water load, if an indirect-fired water heater is installed).

Dec 22, 2021 · Use the boiler size chart below to help you get started. The output in kilowatts (kW) or British thermal units (BTUs) matters with boiler sizes, not the physical measurements. British Thermal Units are units used to quantify how much energy a boiler provides as heat.

Which best describes your heating system? What is the square footage of your home (the area to be heated)? Sq.ft. Location: Please select the city closest to your home. How old is your home? Renovations: Have you made significant renovations to your home? Yes, my house has had major renovations since the original construction.

Key Factors in Boiler Sizing. Boilers are sized based on their heating capacity, which is measured in British Thermal Units (BTUs) or sometimes kilowatts (kW). BTU is the standard measurement for heat energy, and indicates the amount of heat a boiler can produce per hour.

When sizing a boiler for a house, you will need to consider how much hot water you will be using and whether a combi boiler or a conventional boiler plus a hot water tank is the right choice. Ultimately, the type of system you choose will have an impact on the size of boiler you need.