water heater uses chimney #46

msimerson opened this Issue May 18, 2016 · 1 comment


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msimerson commented May 18, 2016 edited


  • blocks the removal of the chimney (#19)
  • existing water heater is 16 years old.
  • water heater had 6 year warranty
  • it's well past a water heaters typical (8-12 years) service life
  • pilot light always burning gas
  • eligible for $300 federal tax credit (GE certification statement, IRS Residential Energy Credits)
  • no drain pan


  • add power venting to this gas heater
  • replace with
    • power vented gas heater
    • heat pump water heater ($817.65)
      • $500 rebate from Seattle City Light (only if replacing electric water heater)
      • bigger tanks, to compensate for longer recovery time
      • 3.25 Energy Factor for GE GeoSpring 50 gallon
    • tankless water heater
      • gas is fast, but would be the only gas appliance.
      • electric uses lots (3 x 40A circuits) of juice


  • buy a heat pump water heater
  • clear out area for new heater
  • install new water heater
    • run new branch circuit #66
    • tie two 30A 110 breakers together
    • in a drain pan
    • connect drain pan to sump drain
  • run new 3/4" copper pipe
    • - (3) 3/4 elbows
    • - (1) 3/4 tee
    • - (1) 3/4 copper pipe
    • - (2) 3/4 copper couplers
    • - (2) 3/4" pipe caps


Excerpt from King County

Expansion tanks

If your water is on a closed system (the water can flow into your building but not out), an expansion tank or other approved thermal expansion device must be installed on your water system. The expansion tank is to hold water that can't be held in the water heater after it expands when it gets hot. If there were no expansion tank, the hot water would be released through the pressure relief valve.

@msimerson msimerson self-assigned this May 18, 2016
@msimerson msimerson referenced this issue May 18, 2016

has a brick chimney #19

5 of 5 tasks complete
@msimerson msimerson added the ready label Jun 7, 2016
@msimerson msimerson added this to the Finish the crawl space milestone Jun 7, 2016
@msimerson msimerson added in progress and removed ready labels Jun 12, 2016
@msimerson msimerson changed the title from gas water heater uses chimney to water heater uses chimney Jun 13, 2016
@msimerson msimerson closed this Jun 14, 2016
@msimerson msimerson removed the in progress label Jun 14, 2016
@msimerson msimerson referenced this issue Jun 20, 2016

fossil fuel freedom #71

2 of 3 tasks complete


water heater front


water heater side

The strapping isn't on yet attaching it to the wall. That needs to wait until after the insulation is on the wall. Then a framing member will be screwed to the concrete wall (through the insulation) and the straps will mount to that.

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