Benen Huntley wrote: The inside of the cavity is rendered which I can remove. The outside is plaster board glued to the render.
Satamax Antone wrote:Can't you take a bit more room, in the back of the heater, to make it deeper? Narrow bells like this tend to have more of a flowing pattern, than heat layer stagnation in bigger bells. This is the case of single bells, vs double bells too.
As well, if you don't need to heat upstairs, it's better to have a lower bell.