Originally Posted By: ecrofutt This post was automatically imported from our archived forum.
I don’t see the regulator in the middle. Could it be a pressure relief valve for excess pressure in the cold water supply.
Did you see the termination point for the TPRV. I once found one that "harry homeowner" had connected somewhat similar to this and then ran the TPRV termination to a supply valve in the "handyman" sink in the garage so he could wash his tools and himself.
Originally Posted By: ckratzer This post was automatically imported from our archived forum.
It seems very weird and I’ve never seen anything like it and can’t think of a reason for it.
I also can’t keep from commenting on the installation.It looks like someone got a PEX crimping tool for christmas and just had to use it.The fittings alone probably cost about thirty $'s.It would have been easier and less costly in this case to finish it out in copper.
I will add ,however and totally off the subject, PEX is great for remodel jobs in tight places that you can’t get to with a torch.
Originally Posted By: wcottrell This post was automatically imported from our archived forum.
Greg,
Some municipalities require small expansion tanks on the cold water inlet to handle expansion in the system since backflow or check valves are required at the street connection. Conbraco make a expansion valve that allows excess pressure to be discharged, but they usually require separate lines to the exterior. My best guess.
Originally Posted By: rmoore This post was automatically imported from our archived forum.
Jay Moge wrote:
Greg, aren't expansion tanks for hot water heating systems, i've not yet seen one on a potable water system. 
Must be a regional thing then Jay. Every newer home here has one at the water tank, and I'd say about 50% of newer replacement tanks are also fitted with them. Recent "code" says you have to have one if there is any type of check-valve at the supply.
I have no idea what Greg's set-up is doing though.
-- Richard Moore
Rest Assured Inspection Services
Seattle, WA
www.rainspect.com
Originally Posted By: rmoore This post was automatically imported from our archived forum.
gbell wrote:
The discharge tube stopped about 2-3 feet once started behind the heater.
This heater is on the second floor. That is another reason that it doesn't look correct.
Unless you count a big wet patch on the first floor ceiling as a "visible termination" that would be also be very wrong. 
-- Richard Moore
Rest Assured Inspection Services
Seattle, WA
www.rainspect.com
Originally Posted By: wcottrell This post was automatically imported from our archived forum.
Greg,
There should be a check valve on the cold water supply if they are using a recirculation pump and an aquastat wired in the electrical line to the recirculation pump. I’ll admit this is the first time I’ve seen a plumber return the recirc. hot water to the drain, usually come in below check valve on cold water inlet.
