Keston 170 substitute

[ALCPlumbing]

Just looked at a Keston 170 that is well beyond repair but customer would prefer not to replace with another Keston yet it has to be a twin pipe flue system. I've looked at the Atag Q51 as another option but have never installed one or worked on one. Just wanted some advice on whether Atag is the only other boiler that can use the twin pipe flue system and if they are better than Keston. I imagine they can't possibly be any worse. Any advice would be greatly appreciated.
Thanks

 

[Gasguru]

Join the combustion chamber...plenty of advice about Atags.

 

[ALCPlumbing]

Thanks. I have applied for the combustion chamber but still waiting.
Cheers, J.

 

[Proffang]

Latest Keston Heat 45 or 55 boilers are made by Ideal and based on Ideal Evomax light commercial, so tried & tested.