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BTU Calculator

Follow the instructions below to calculate the size and quantity of radiators that you require to heat your home.

Determining the Right Radiator Size

Choosing the correct radiator size is a pivotal aspect of achieving effective heating in your home. Here's a straightforward guide:

1. Match Radiator Size to BTU Requirement

We recommend selecting a radiator size that falls within a 10% range of your calculated BTU (British Thermal Units) requirement. This ensures that your radiator can efficiently meet your heating needs.

2. When in Doubt, Opt for Slightly Larger Radiators.

In the case of uncertainty between a smaller and a larger radiator, it's advisable to lean towards a larger option. The reason is simple: Oversizing a radiator allows for flexibility. You can always adjust a larger radiator's heat output downward to achieve the desired temperature comfort, but you can't expect a smaller radiator to produce more heat than its capacity allows.

Choosing the Appropriate Radiator: A Step-by-Step Approach

Determining the right radiator size involves several key considerations. Here's a step-by-step process:

1. Calculate Your BTU Requirement

BTUs are the standard unit for measuring radiator efficiency. To determine your specific BTU requirement, factors such as room dimensions, window size, and wall material are taken into account. For an accurate calculation, it's recommended to enlist the services of a professional plumber. However, you can use our Quayside Plumbing BTU Calculator as a reliable guide for estimating the BTU and Watt output needed to heat your room effectively.

2. Consult Our BTU Calculator

Our BTU Calculator simplifies the process of estimating your room's heating requirements. By entering essential room details, the calculator provides an approximate BTU value required to maintain a comfortable and inviting atmosphere.

3. Consider the Total Heat Output

Keep in mind that the calculated BTU figure accounts for the combined heat output of all radiators and towel rails within the room. Larger rooms may necessitate the use of multiple heating sources to achieve even warmth throughout the space.

This approach ensures that you make an informed choice when selecting radiators for your space, optimizing comfort and energy efficiency.

Feel free to reach out if you have any further questions or require assistance with your plumbing needs.


Quayside Plumbing
Mariners Wharf
L3 4DA



Phone: 07795 067193
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