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Tankless water heater pipe size vs performance
doooglasss
Member Posts: 18
I've posted here before and sorry for all the questions, but I'm renovating my house so there are always more. In the past I've had great responses on this forum so I figure I'll come back for more!
I'm about to re-plumb my bathroom and kitchen hot water feeds to a Uponor EP valved manifold - essentially making a central distribution point with a per fixture hot water feed instead of a branched model.
I currently have a Burnham KV74 with side mounted DHW coil. The manual claims the inlets are 3/4" NPT, however, whomever plumbed this setup decided to use 1/2" copper about 4 feet above the boiler. Up until that point there is 3/4" copper supply & return.
I'm wondering if the restriction in flow from 3/4" to 1/2" would be reducing my hot water performance at all?
I know this boiler needs to be replaced for my purposes, but I am trying to work with it for now and prep the home for a boiler/tank swap by running pex in the ceiling before I close it back up with drywall.
I'm about to re-plumb my bathroom and kitchen hot water feeds to a Uponor EP valved manifold - essentially making a central distribution point with a per fixture hot water feed instead of a branched model.
I currently have a Burnham KV74 with side mounted DHW coil. The manual claims the inlets are 3/4" NPT, however, whomever plumbed this setup decided to use 1/2" copper about 4 feet above the boiler. Up until that point there is 3/4" copper supply & return.
I'm wondering if the restriction in flow from 3/4" to 1/2" would be reducing my hot water performance at all?
I know this boiler needs to be replaced for my purposes, but I am trying to work with it for now and prep the home for a boiler/tank swap by running pex in the ceiling before I close it back up with drywall.
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Comments
Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.
Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
1/2 " pipe may improve the performance and prevent you from overdrawing the tankless which have questionable capacity