Barrybpdx
New Member
i'm replacing the 1926 galvanized pipes and i'd like to feel confident about the pipe sizing i'm planning. my goal is to have adequate supply (of course) but not waste too much hot water waiting.
- my "fixture units" count is 30 on 3 levels
- i think the city is giving me around 40 psi
- i've got 3/4" galvanized from meter to house (which i'm planning to replace with 1" copper soon but not now)
- once in the house, i'm running 1" copper to the HWH and to where the cold starts branching
- 3/4" copper from HWH and serving all branches
- 1/2" copper on branches which are grouped like this:
- tub/shower w/ remote pressure balance
- shower, toilet
- toilet, hose bib
- 2 lavs
currently everything inside the house is 1/2" galvanized except for 3/4" to the HWH and to the first branch and this gives us acceptable flow.
as for not wasting so much hot water, i'm thinking of a tankless heater in the attic above the upstairs bathroom which is where 80% of the waste occurs.
our 50 gal HWH is plenty big for us, but those recirculating systems still waste energy on re-heating the water even if the water itself is conserved.
- my "fixture units" count is 30 on 3 levels
- i think the city is giving me around 40 psi
- i've got 3/4" galvanized from meter to house (which i'm planning to replace with 1" copper soon but not now)
- once in the house, i'm running 1" copper to the HWH and to where the cold starts branching
- 3/4" copper from HWH and serving all branches
- 1/2" copper on branches which are grouped like this:
- tub/shower w/ remote pressure balance
- shower, toilet
- toilet, hose bib
- 2 lavs
currently everything inside the house is 1/2" galvanized except for 3/4" to the HWH and to the first branch and this gives us acceptable flow.
as for not wasting so much hot water, i'm thinking of a tankless heater in the attic above the upstairs bathroom which is where 80% of the waste occurs.
our 50 gal HWH is plenty big for us, but those recirculating systems still waste energy on re-heating the water even if the water itself is conserved.
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