Vaillant Combi Boilers
‘Combi’ is short for combination boiler and does two things, heats water and provides central heating for your home.They are ideal for smaller homes, as there’s no need for a water storage tank, as the boiler’s connected directly to the water mains so water is only heated as and when needed.

Vaillant System Boilers
System boilers, also known as sealed system boilers and have the heating and water systems built into the boiler itself. They are ideal for homes with more than one bathroom and give a constant supply of hot water.

Vaillant Regular Boilers
Regular boilers, also known as open vent boiler, provide central heating and hot water through a hot water storage cylinder, often found in an airing cupboard, and cold water tank usually found in the loft. They are perfect for homes with multiple bathrooms, as they can provide a lot of hot water at once.