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[Taxi_Driver]

Had to laugh when some neighbours moved in recently. First thing they did was to remove the perfectly serviceable boiler + DHW tank and install a modern combi - in the loft!

Someone reads the cr@p they write in homebuyer's reports, then.

I wouldn't be surprised if they've lost efficiency given that they're now losing any waste heat from the boiler, and I hope they got a water softener too, or the heat exchanger will go for a burton in quick order with our water..

I'd be worried if a new boiler was generating any excess heat.....I never had the rad on in the kitchen with the old boiler as it used to act as a rad....with the new boiler, which stays cold to the touch, I've had to turn on the rad in the kitchen....

[Marks DTM Calib]

That actually tells you nothing, the only waste comes from poorly combusted fuel and heat in the exhaust which goes out the flue. 

The fact your boiler casing is not warm is meaningless (although no doubt part of the skewed efficiency calculations) as your now having to pass the heat via your heating system. 

[Taxi_Driver]

That actually tells you nothing, the only waste comes from poorly combusted fuel and heat in the exhaust which goes out the flue. 

The fact your boiler casing is not warm is meaningless (although no doubt part of the skewed efficiency calculations) as your now having to pass the heat via your heating system. 

And that's what its all about....my old boiler (when I looked it up online) had an efficiency rating of 65%...and that was when it was new...32 years on and I guess maybe 50-55% . Im not joking when I tell you it used to take about 30 mins to get a hot tank of water to 55C (with the burner continuously running)...heating on only and used take an hour to get rads hot (again continuously running) ...hot water and heating on.....think about 2 hours of boiler continuously running to get rads hot.....nice and warm in the kitchen tho