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Posted by Heatpro on April 25, 2006 at 13:32:52:
In Reply to: Re: which is a good gas type hot water boiler posted by joe on April 25, 2006 at 11:25:37:
If the heat loss of the apartment(s) it will serve are larger than the lowest modulating output of the Munchkin, and there are no other zones to cut the output from the boiler to below the lowest modulation setting by shutting off the flow at times, then there is no need to use a buffer tank like the ErgoMax. You could use any external water heating indirect tank then.
Using an ErgoMax with a small-water-volume boiler heads off sizzling and banging problems from improper awareness of flow requirements and provides the same hot water as another indirect, so it is a sort of 'trouble-free' flexible installation mate.
You can get into problems going for maximum efficiency which doesn't mean the same as dependability and effectiveness. The reason a small-water-volume device shows up with a higher efficiency rating is simply because it doesn't have any place to store heat, so no heat shows up in cool-down measurements. This doesn't mean it is superior to a tank added to it that stores heat and can also be super-insulated by more insulation around it.
I only suggest adding an ErgoMax-concept tank to a small-water volume boiler to avoid problems that people aren't aware of - and most aren't aware of mass-timing problems in boiler systems.