What size boiler do I need for a Glasgow home?

Boiler size should be based on actual heat and hot-water demand, not simply the number of bedrooms. For a combi, the required hot-water performance often drives the output choice. For a system or regular boiler, the heating load and cylinder arrangement become more important.

A survey should consider the property's size, heat loss, radiators, number of bathrooms, incoming water performance and how many hot-water outlets are likely to be used at the same time. Oversizing is not automatically beneficial and can contribute to inefficient cycling if the boiler cannot modulate low enough for the property's normal heating demand.

Doherty offers several boiler outputs in its Glasgow package range. The correct model should be chosen after the system is assessed rather than by selecting the highest kW figure on the price list.