Underfloor Heating – How much pipe do I need ?

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Choosing the right type of underfloor heating system can seem like a bit of a complicated and daunting task. The type of system required and the materials needed is determined by the limiting factors of the buildings construction. When I say this I mean the floor build-up heights, required room temperature, output temperature of heat source and many other design elements. The only real way of determine the type of system required for your project is through careful observation of project details and correct heat loss calculations and system design.

Required materials

Determining the required amount of materials needed for your project can be done without the full underfloor heating schematic being present. We can achieve a rough understanding of how much pipe is required, by doing the following easy sums.
Multiply the floor area (m²), by the amount of pipe contain within the meter squared.

A 100mm pipe spacing contains 10 linier meters of pipe, within a meter squared.
A 150mm pipe spacing contains 6.7 linier meters of pipe, within a meter squared.
A 200mm pipe spacing contains 5 linier meters of pipe, within a meter squared.

So say if the 30m² room required 150mm pipe spacing to allow the underfloor heating system to operate correctly, the amount of UFH pipe need would be; 30 x 6.7 = 201m. Now we know that to heat this room sufficiently we would require 201 meters of pipe, but system loops cannot exceed 110 meters in length. This would mean that two separate loops would be required to enable the system to operate correctly, giving an indication to the amount of ports required on the underfloor heating manifold.

Following this method on a room by room basis will give an accurate indication to the amount of pipe, manifold, and other equipment needed in the installation. When following this method it is of the utmost importance to remember issue like tail rums, wastage and pipe coil size’s and adjust your calculations accordingly.

Good luck chaps, and don’t forget to call back soon for more underfloor heating design and installation tips. UFH Supply
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