Ariston Condensing Combi Gas Boiler CLAS Review

“As a 'heating engineer' (C&G, HNC, B.Eng) and plumber...”

Written on: 29/12/2009

As a 'heating engineer' (C&G, HNC, B.Eng) and plumber with many years experience of the domestic and latterly commercial sectors, I was looking for a boiler for personal and immediate family use. The consensus of opinion from trade counters was Ariston were expensive and unreliable, nothing could be further from the truth and the boiler is as good as any in every respect and in one area (control) is head and shoulders above the competition.



In essence a condensing boiler can be up to +90% efficient but only while condensing and only specially designed systems can maximise this effect.

Cleverly Ariston's CLAS HE can have fitted an outdoor sensor (+£14) which utilises activates their compensating control mode. This regulates the heating water circuit in relation to the outside temperature hence remaining in condensing mode for the majority if not all of the operating period (as opposed to limiting condensing to the 30-45 min start-up period) and resulting in significant annual energy/cost saving.

To make it truly the best it can be Ariston will have to incorporate a optimised on/off into their boilers control as standard, nevertheless a class leader..



On durability I'm not in a position to comment but would not have installed three with a pending fourth if not suitably impressed with the first..