The best options, in terms of costs, health and environmental effects are
Radiant heaters: • Woodburner (10 – 11c/kwh) • Pellet burner (13 – 19c/kwh) • Convection heater: • Heat pump (5 – 9c/kwh)
Less beneficial are
• Flued natural gas heaters, which radiate heat but create
greenhouse gas emissions • Electric heaters, which create radiating heat
but are only useful in small spaces. The least beneficial ones, which are also among the most expensive, are: • Unflued LPG heaters, which create unhealthy living
environments and • Open fires with an efficiency rate as low as 15%.