I don't believe that all FHW systems require temperature in the boiler to be maintained just in case of a heat demand. I have two Biasi FHW systems and they are both cold start. No constant boiler temperature. Boiler only fires when there is a heat demand....not on standby. I also put a simple $1 switch on the hot water tank thermostat line so I can interrupt the circuit and not have hot water when we are away for days/weeks. Took about 1o minutes to wire it in and works like a charm. No need to produce hot water or maintain hot water temp in the indirect water tank when nobody id around. Just flip the switch.
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