High BTU Cast Iron Radiators

How to calculate BTU output for a cast iron radiator

Our free heat calculator takes into account:

• Room dimensions: height, width and depth
• Window area and glazing type (single or double, wood or metal frame)
• Room type: living room, bedroom, hallway or kitchen, bathroom
• What is above and below the room: heated rooms, insulated or uninsulated roofs, floor types
• Number and type of outside walls: brick cavity, insulated cavity, solid brick or wood frame

The calculator outputs the watts and BTUs your room needs and then shows you the minimum number of sections required for each Paladin model at each available height. It's an estimate rather than a full heat loss calculation, but it gives you a solid starting point before calling us for a precise specification.

Top picks for high BTU cast iron radiators

Churchill: At just 350mm tall and 3 to 40 sections, the Churchill delivers 141 watts and 480 BTUs per section, making it one of the highest output-to-height ratios in the range. Suited to under-window runs in conservatories, bay windows and loft conversions where ceiling height is restricted but BTU demand is high.

Neo Georgian 6 Column: The deepest column option in the range, giving substantial heat output per section. Available in 505mm, 660mm or 960mm heights with 3 to 40 sections. The 660mm is the closest match for high BTU cast iron radiators at 600mm. The 960mm suits large rooms where tall heights and deep columns combine for maximum output.

Neo Georgian 4 Column: Available in 360mm, 505mm, 660mm, 760mm or 960mm heights with 3 to 40 sections. More height options than the 6 column, making it the most flexible high BTU choice for rooms where output needs are substantial but not at the maximum end.

Where do high BTU cast iron radiators work best?

Large period living rooms and drawing rooms: thick walls, single glazing and high ceilings all increase BTU demand. A 6 column model at 960mm in a long section run handles the load. Conservatories and garden rooms: glazing on multiple walls creates high heat loss. The Churchill at 40 sections gives serious output in a low footprint. Hard-to-heat hallways: tall stairwells and Victorian-era hallways with single-glazed fanlights need more BTUs than their floor area suggests. Loft conversions: insulation levels vary significantly and sloped ceilings limit height options, making the Churchill's high BTU-to-height ratio ideal.