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[slimjim]

I like copper! Pex could be used but it typically looks like crap and by the time you buy the fittings, they are pretty close to the same price, also remember that if yo do have a leak, pex typically cannot be reused whereas copper can

[heat550]

That's a pretty good point. I'll see what I can find . 

Heat550

[heat550]

I like copper! Pex could be used but it typically looks like crap and by the time you buy the fittings, they are pretty close to the same price, also remember that if yo do have a leak, pex typically cannot be reused whereas copper can

11/4 x11/4x1 tees are a bit spendy on the pex side.need 8  would going with 1 1/4  on inside loop from 1 inch from stove be worth extra $$ . whats best online supplyer of 1 1/4 pex. Reason going with pex I have crimp tool. I'll have to keep washroom door shut 

Heat550

[heat550]

Are your circs all on the return sides? If so air elimination would be easier to achieve if they were all on the supply side, also your domestic hot water could be done with a mono flow tee instead of a circ because you will want a constant flow through it without restricting the primary loop.

Pex mono flow where would you find these ? and do I need 1 or 2 of them for my hot domestic water heater. I seen you can put 2 going in opposite direction for more flow . but I would guess more restriction also . I going with 1 inch pipe on everything except 3/4 to domestic hot water side arm I seen price on 1 1/4 $$$$$$ . coppers cheaper then pex but still wow $$$$$.  pex 1 1/4 tees like 27 bucks crazy .

Heat550 

[heat550]

Heres idea for domestic side arm .put 2 tees in primary loop them put ball valve in between the 2 tees . you can adjust the flow with ball valve . bit like adjustable mono flow.  I'm sure someone else dreamed this  up before. This also work on plate exchanger for adjustment. So you would have controll where how much go where.

Heat550