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Note to the diagrams: in the case

Note to the diagrams: in the case of pump operation, a return valve is closed by over-pressure on the pump output; in the case of pump switch-off, the valve is fully opened.)). Electric boilers are a specialized item that is usually reserved for industrial and commercial applications---the operational costs are usually prohibitively high in residential venues unless you happen to live in an area where the cost of electricity is less than .05 cents per kwh--even.

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