Hi everyone,

I'm DIY plumbing our off-grid cabin, and I'm using up material I have on hand to do the job. I have a 3/4" pvc line coming into the house (off a 1.5" PVC pipe coming up from my water meter). To get water to a bathroom and a water heater I need to do a run of about 28', then right angle and another 12'. Stubbing up along that route I am servicing a toilet, a bidet, a lav, a washing machine a shower and a bathtub. I have on hand several lengths of 1" copper I'd like to use up. My question is, if I go from 3/4" PVC to 1" copper, then reduce to 1/2" at all the stops (except 3/4 at the water heater), will I be creating problems with my water pressure?

Does the pressure at the end of the line only reflect the pipe diameter at the end point, or will I see a net pressure drop expanding from 3/4 to 1" for a middle segment of the run?

Thanks for your input!

you will be improving the piping not hurting it.

you'll be fine

Do you have all the fittings and torch to solder the copper, then connect to PVC? Even in high-cost California, 10'sticks of 3/4 PVC are under $4. 1" copper fittings are quite expensive.

Just checking prices here on PlumbingSupply.com:

Copper T 1" x 1" x 1/2" $10.45
PVC T 3/4" x 1/2" x 3/4" $1.37

You might want to save the copper pipe for a future long run.

Good point, the fitting cost increase could quickly go beyond the savings from not having to buy 3/4" copper.



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