Originally Posted by Saltyhog
I was planning on using the Seatech push-on fittings per MaineSail. Have you had trouble with those? Was planning this route because of the cost of the tool and ease of assembly and fitting in the tight spaces where boat plumbing
lives. If you've had trouble with them though, I'll buy the Wirsbo tool and go with the Uponor fittings. I have 2 boats to re-plumb, so at least the cost of the tool is spread out a bit. Do enough boats and the cost of the Seatech fittings out-paces the cost of the Wirsbo tool (Milwaukee). -Tom
I have hundreds and hundreds of the Watts/Sea Tech fittings in use. Not a single
leak. I also used to be a rep for one of the largest PEX manufacturers in the US. I was a rep for radiant PEX products well before it was even legal
for domestic plumbing, only heating
systems when I was selling it. We sold millions and millions of feet of oxygen barrier PEX, and the fittings, back when there were only a few players US Brass, Rehau, Wirsbo, Heatway etc.. .
The crimp fittings are fine but they lack the ability to disassemble for winterizing or to rotate etc.. The brass fittings also tend to eventually turn green and look like crap on a boat.
The biggest problem with the push on fittings is people trying to mix metric sized tubing with 1/2" or 3/8" fittings or vice-versa. The other issue is using poor PEX cutting techniques or tools. When used correctly the plastic Watts push on fittings are tremendous and well exceed any pressures we'd ever see on boats.
Again, hundreds and hundreds of them installed on boats and not one single
leak. Watts does not put their name on junk products. Sea Tech is a Watts product..
I also own multiple brands of PEX crimp tools from the original Wirsbo & Rehau radiant stuff to Quest & others. On boats I much prefer the push on fittings from Watts.
If doing a shore based radiant installation
I generally use the Wirsbo or Rehau style fittings. Even when domestic plumbing with 100PSI street pressures I use the Wirsbo style, but on boats we simple don't even come close to the pressures we see in commercial
or domestic plumbing or heating
applications. At home however I have multiple Sea Tech fittings under our sink for a water
filtration system. Our street pressure here is about 100PSI. Those have been in place for over 8 years...
I do also use 3/8" PEX and the fittings, much easier to route on a boat. I have had zero flow issues at the GPH and pressures we use on boats. It is rare to find a marine
pump or a typical cruisng boat that exceeds 55 PSI.... Most are 30-40 PSI and 2-4 GPM...
I do suggest using straight PEX lengths rather than coils. Coils are often cheaper but a real PITA on a boat... The Watts/Sea Tech fittings don't need to be purchased at a marine
store either. I get mine from my local plastic pipe distributor or any of my local plumbing supply houses.