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Plan your space

Quick BTU calculator

Enter your room measurements for an estimated heating requirement. Compare radiators without leaving this page.

Starting assumptions: two adjacent outside walls, 1.5m² low-E glazing, insulated cavity walls, ground floor and insulated loft. Check these against your room.

Check or change room assumptions

U-values describe heat passing through a surface; use known building values where available. −3°C outdoors, 10°C below and the default U-values are preliminary assumptions, not a location survey. Unheated lofts use the outdoor temperature; heated floors/ceilings use U 1.36/1.62 and the adjacent-room temperature.

Preliminary rectangular-room estimate, not an installer’s heat-loss survey. It excludes detailed thermal bridging, ground/loft modelling and ventilation-system design. Confirm the room heat loss and radiator output at your heating-system temperatures before ordering.

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FAQS And Guides

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14 Nov Why Is My Bathroom Extractor Fan Dripping Water?

Why Is My Bathroom Extractor Fan Dripping Water?

Water dripping from a bathroom extractor fan can come from condensation inside a cold duct, rain entering through the outdoor vent, or a leak above the ceiling. The timing is your first clue. If water is coming through the fan housing, stop using the fan and arrange an inspection by a qualified electrician. Leave the cover in place.Is it condensati..
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08 Jun Towel Radiator Wall Brackets: Choosing Fixings and Planning Installation

Towel Radiator Wall Brackets: Choosing Fixings and Planning Installation

Match the brackets to the exact radiator and choose wall fixings for the wall structure and the filled radiator’s load. Supplied plugs do not suit every wall.
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03 Jun Bathroom Towel Radiator BTU: Watts, Heat Loss and ΔT

Bathroom Towel Radiator BTU: Watts, Heat Loss and ΔT

Understand BTU/h, watts and ΔT before choosing a bathroom towel radiator. Compare heat loss with output at your system’s operating temperature.
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26 May Towel Radiator Installation: What to Check with Your Installer

Towel Radiator Installation: What to Check with Your Installer

Plan the wall support, connection centres, valve arrangement and heating-system requirements before fitting a towel radiator. Use the instructions for the actual products.
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