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5 to 10 gallons of sizzling water with recovery instances ranging from 30 to 60 minutes. Burner apparatus including a burner, is disposed in an operative relationship with the heat exchanger for heating water flowing via the heat exchanger. An electronic direct spark ignition board and a Gas Regulator with an automatically controlled Dual Solenoid shut-off valve are offered for working the burner apparatus in response to the necessities of the ANSI Z21.10.3 security standard. BTU ranges at different water circulate rates. This characteristic is achieved using a low value metal disc thermostat to instantly activate the Dual BTU valve with out the necessity of an costly microprocessor management. This is a necessary security feature also known as a Limit Switch. A further safety feature is achieved by incorporating a Relay and a metallic disc thermostat on the exhaust housing that trigger the induced draft blower to stay working after every burn until the exhaust housing reaches a low temperature, thus eliminating thermal stress on the heat exchanger and exhaust parts.

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