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I am plumbing a spa with a 5.5kW flow-thru heater. Can the water flow through the heater from either end?

April 26, 2017flow flow-thru heater plumbing spa water

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I am plumbing a spa with a 5.5kW flow-thru heater. Can the water flow through the heater from either end?

1 Answer

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As long as there isn’t a flow switch in the heater it doesn’t matter which way the water flows. Flow switches are directional and pressure switches are not. However, pressure switches have to be installed on the output side (pressure side) of the pump while a flow switch will work on either side. As far as the heater itself, as long as it is filled with moving water it doesn’t matter which direction it flows.