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A condensing boiler is critical to any efficient heating system. When it is used in conjunction with additional thermostatic control valves (TSV) fitted on the radiator and a thermostat on the hot water tank, you can create a super high energy efficient heating system.
Maximizing Hot Water Heater Efficiency
'Flash' and 'On-Demand' are just the different ways to call tankless water heaters. More significantly, on-demand tankless water heaters actually cuts down your energy costs that are used to heat water by half, and unlike the traditional tank system you get endless stream of hot water that never runs dry.
