Every like you do, and then have an explosion.
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18 years ago
New gas meter comes, old boiler fired.
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18 years ago
That should be OK then as it doesn't modulate in anyway. I run it using zone valves so its always running at maximum efficiency.
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18 years ago
A pump over-run can help reduce this effect. But yes, it makes them a great deal less efficient during part load conditions.
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18 years ago
If it doesn't modulate then for much of the year it will be running in stop start mode. Where the floor standing CI boilers really lose it is that when they cut out there is a huge amount of heat stored in the heat exchanger which disappears out of the flue. Thus you may get a quoted efficiency of 75% but in use it's more like 55%. This phenomenon lessens if the boiler has a low water content heat exchanger or fan flue.