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Expansion Tank

Val_LIVal_LI Posts: 9Member
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.


  • SWEISWEI Posts: 5,222Member ✭✭✭✭
    Some codes

    require them for all installations.  From an engineering standpoint, anytime you have a check valve (or something that acts like one) between the incoming water supply and the water heater, you need one.  PRVs act like check valves.
  • R ManninoR Mannino Posts: 362Member ✭✭
    North Shore or South Shore?

    The north shore has higher water pressure which has presented a problem sometimes. I recommend the DHW expansion tank and some manufacturers require it for the warranty to be in effect. Just my two cents.
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