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I am turning my master bath into a "wet room". The shower area will be curbless, use a linear drain, and include Ditra-Heat. Adjacent to that space I will have a freestanding tub sitting on top of the tile. I need a way to perforate the Kerdi membrane for my drain while maintaining waterproofing...

I just took my first hot shower at home in a long, long time. The new valve (Caleffi 520) was a different configuration, so I took advantage of the opportunity to make sure that all three ports had a good straight run of pipe. I installed the valve and voila! everything is working perfectly. I...

I just throttled the cold water and the results were the same. So looks like the exorcism is in order. We'll know tomorrow after I try the (third) valve.

Interesting idea! I'll try that when I get home. Meanwhile, Caleffi recommended their 520 valve (which I ordered). It's going to require a reconfiguration of my piping, but that's small potatoes compared to the rest of this saga.

I agree. It seems like the conditions are such that everything should be working properly or close to properly. I'll call Caleffi and try valve #3. One question: While I'm in here messing around I've been thinking about tightening up the piping. Right now the cold water for the mixing valve is...

Well, I'm back and the news isn't good. I removed the valve and union coupling and soldered on a couple of threaded ends. I put an analog WATT water pressure gage on each end (in turn) and let it sit for 10 minutes before taking the measurement. I measured flow rate (quantity of water into...

OK. Thanks everyone for the help. My next steps: I'm going to measure pressure and flow rate on the mix side of the valve. Then I'm going to pull the valve and measure pressure and flow rate on the hot and cold sides. I'll report back when I have results (early next week). Thanks again. Have a...

This is exactly what I am thinking. Maybe there’s some weird pressure that it is tricking it into thinking that it is mixing properly.

Oh! I just put it where the old one was. Is there supposed to be more room between the mix and that first 90? I could see that causing a bit of a back pressure.

It seems like 2.6 gpm is enough for what we’re doing. Taco pump: 007-BF5. No info on the coil, but it definitely doesn’t get used for 7 months or so at a time.

I could pull the valve, use the shutoff above it for the cold, and see what comes out? I'll have to think of a way to contain the water... but that's easier than redoing all the extra pipework. There appear to be cleanouts at the y check valves. I could open those all up and make sure nothing...

OK. The hot Webstone EXP E2 valve has a very slow drip at the main (yellow) shutoff. I was thinking about replacing that (although it appears that I have to buy the whole kit). In the absence of other ideas should I simplify the plumbing to this (see image)? Another thought: Could there be air...

Right. But it’s the second mixing valve to produce the same results. It makes me think that there’s something wrong with the pressure on one side of the valve, but that’s a complete shot in the dark.

Heater cleaned annually and completely overhauled two weeks ago. Rinnai 94LSi propane with the commercial controller (to enable higher temp settings). Emergency heat gets called by the thermostat at temps near freezing. Turns on the pump which sends hot water to the heat exchanger inside the...

OK. I apologize for the delay--big day at work yesterday. I have created a diagram of the system since the pictures sucked. It includes everything that I have tested in the system. I agree with John that if something worked and now doesn't that something changed. I assumed first that the heater...

At first I thought that was left over from the previous system and that maybe I could pull it. But there is a closed, recirculating loop in the system that feeds the emergency heat at the heat pump. There is no storage fixture there, but would that necessitate the expansion tank?

Yes! Inlet hot is currently 150. Inlet cold is 49. Outlet mixed is 99.

I should add that at the valve the hot is 150 degrees and the cold is 49 degrees. It leaves the valve at 99 degrees. I can change the temperature at the tank anywhere from 120 to 185 and the mixed temp is within a degree or two of 99.

This is the best I can get. There's not a lot of room in there. I can diagram it for you if that would help. I tried to align the two pictures, but I'm sure you get the idea. Note that there are a bunch of one-way valves in there. Like I said, it worked reasonably well for a number of years...

Great question! I checked that too. It's throughout the house (including immediately after the valve).