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Hot surface ignitors or HSI for short vs. Direct Spark. These are two different methods that natural gas or propane appliances use to ignite the flame for heating purposes.
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By Gary McCreadie4.8
208208 ratings
Hot surface ignitors or HSI for short vs. Direct Spark. These are two different methods that natural gas or propane appliances use to ignite the flame for heating purposes.
Check out Jobber www.getjobber.com/hvacknowitall

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