With an output of 18kW for central heating, this system boiler can comfortably heat a home with up to 15 radiators and a single bathroom. However, if your home requires a higher demand for central heating, the Clas HE Evo 24kW, Clas HE Evo 30kW, Evo 24kW or Evo 30kW system boiler may be more suitable.
System boilers are ideal if your home requires instant hot water in multiple bathrooms simultaneously. This is thanks to the additional hot water cylinder that is installed in an airing cupboard or similar sized space, alongside your boiler unit. It is important to take note of this when purchasing a new or replacement system boiler, as you will need the extra room in your home. If space is limited in your property, then a combi boiler will be a better option.
The Ariston Clas HE System Evo 18kW also has an efficiency rating of 90% and an ErP A-rating for heat, which means that this boiler could help lower your energy bills, depending on the efficiency of your current heating system.
