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Expansion Tank

Val_LIVal_LI Member Posts: 9
Plumber I'm thinking to hire says I don't need Expansion Tank for my DHW.

I'm planning to have Lochinvar Knight boiler with Lochinvar 80GAL indirect water heater. There is NO recirculation line for hot water.

Plumber states since there is no recirculation line, no expansion tank needed.

Is that true? Please help me understand.


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