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Has anyone installed an Xtreme or Xclusive Combi Boiler. How do they compare to the Eco RF36. What is the financial justification for paying the extra for the new models? There is some information on the Intergas website about boiler efficiencies, but no indication of the likely annual savings...

I have an old Vaillant Combi Boiler linked to a Honeywell Evohome which currently uses simple on off control of the boiler. I need to get the boiler replaced and plan to fit a Honeywell R8810A open therm bridge. I was initially planning to get a Veissmann Combi but reading up on it there...