Chimney flue?

What’s the correct size diameter  for 1 gas fired 50 gal. 40,000 btu water heater and 1 natural gas 40,000 boiler. Chimney can accommodate up to 6”only. Stainless steel or aluminum?

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  • 3 weeks ago

    Aluminum may melt

  • 3 weeks ago

    please see the install instructions for the water heater. you need at least twice that total cross section [area of the circle -- pi are square, right?]

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