Use a T fitting or home run - 1/2 hot water

[Russell Harris]

Hi,
I need some advice on a hot water Pex-A run to a second bath. I've got a 3/4" copper to 3/4" PEX-A transition which then goes into a 3/4" flow through EP manifold. The 3/4" line continues on to an addition that is 3/4" copper.
Off the manifold I would have these hot water 1/2" runs:
- Washing machine - 10'
- Kitchen sink/dishwasher - 30'
- Hall shower/tub - 35'
- Hall sink - 37'
I'm considering combining the Hall bath hot water run to one home run line and then install a T for the sink.
This would save that second home run to the manifold of the sink. Is there any problem with this design?
While I could move the manifold closer to the bath/kitchen area, I wanted to minimize the amount of water that had to be run before hot water arrived at the fixture. Am I correct that having the 1/2" line will deliver the hot water quicker?

I don't see the sink being used while someone is in the shower hardly at all. The bath is a basic 1952 size and services the people in two bedrooms on that end. Think the kids bath.

Thanks for any advice!
RH

 

[Russell Harris]

Here's a diagram to show what I was thinking.

 

[Sponsor]

 

[Reach4]

Teeing as you propose is good.

If you wanted to get fancy and expensive, you could tee down to 3/8 for the lav near the manifold. Then the hot water arrives in about 60% as much time as with 1/2 inch pex to the lavatory.

Very few people do that. 3/8 pex A is expensive to buy a roll usually, you need another kind of rings, and your tool may not support 3/8 with what you have.

 

[wwhitney]

A single master bath may only need a 1/2" supply, depending on what the fixtures and flow rates are.

Cheers, Wayne

 

[Jeff H Young]

Teeing as you propose is good.

If you wanted to get fancy and expensive, you could tee down to 3/8 for the lav near the manifold. Then the hot water arrives in about 60% as much time as with 1/2 inch pex to the lavatory.

Very few people do that. 3/8 pex A is expensive to buy a roll usually, you need another kind of rings, and your tool may not support 3/8 with what you have.

Reach 4 nice Idea Ive never run 3/8 inch for anything befor but noticed that bigger is not better when waiting for hot water, My brother has an old house with a detached guest house the hot line is 1/2 inch od copper (soft refridgeration?) it was there when he moved in. I noticed his wait for hotwater a lot better than one I plumbed in 3/4 copper. Im a big fan of a recirculating system but that is a bit pricey as well

 

[Russell Harris]

Teeing as you propose is good.

If you wanted to get fancy and expensive, you could tee down to 3/8 for the lav near the manifold. Then the hot water arrives in about 60% as much time as with 1/2 inch pex to the lavatory.

Very few people do that. 3/8 pex A is expensive to buy a roll usually, you need another kind of rings, and your tool may not support 3/8 with what you have.

Thanks Reach4. You are correct that my Milwaukee Uponor tool didn't come with the 3/8" head and I didn't want to invest in it just for that one line.

Thanks everyone I'll stick with the Tee plan!
RH