Cold water pre heat provides limited free cooling by the detail where cold replacement water passes through the tubes in the floor before it goes to the tank.Be aware that these benefits are only available with quality water heaters and may not be realized with cheap models. They can operate at low temperatures and they enable condensation of the flue gasses. Domestic water heaters are potentially more efficient than a boiler.
The “Open Direct System” is compatible with solar.Lower first cost presents the opportunity to buy a better, more efficient unit.One set eliminated and the other reduced because of efficient utilization. Dual use designs have less than ½ standby losses of two independent methods.The “Open Direct System” uses radiant heating which is fundamentally more energy efficient.Open Direct System Energy Efficiency Benefits.
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