Condensing boilersEnergy efficient boilers
Provides heat and hot water without water tanks or cylinders.Two kinds - gas or electriccombiboiler.Get unlimited heat and hot water.
Need little spaceMight reduce water pressure if hot water is needed for more than one tap at a time.Installation is tricky.
Also known as sealed system.Come with a water cylinder and no water tank.Can get hot water from multiple taps at the same time.Hot water can run out, have to wait for it to reheat.
Also known as open vent or regular boilers.Have both a cylinder and a tank.Can get hot water from multiple taps at the same time.
Have simple controls and tends to be more reliable as less can go wrong.Hot water can run out and you'll have to wait for it to reheat.
Aren't strictly a boiler type.Are energy efficient.Captures heat which would escape from the flue of a non-condensing boiler and reuses it.
All boilers are energy-efficient since 2010.All boilers are assessed and given a rating.