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Thank you! This information is very helpful. I think I understand the design I need to go with. Sounds like this will likely not be an issue. Codes did not call me back today but doing a bit of research it does seem like PA uses the IPC.

The photo I have would be as if you were looking at it from the side. Sorry I think I just noticed where some confusion is coming from whether or not these are vertical or horizontal lines lol. So I would use a sanitary tee going from the sink/shower (horizontal lines) to the vertical wet vent...

The sink and shower will go horizontal until they meet the vertical vent pipe. So I should definitely use a sanitary tee. Does that mean I shouldn't use a Y at the bottom when it goes from vertical to horizontal then?

Hmmm... just had a thought. Would this I'll double check with my area. It is in Lebanon County. They tend to be somewhat lenient with codes. I might even just call them for that particular question. The sink is only a 5' run while the shower would be about 2'. I will make sure the shower has...

I am trying to fix some plumbing issues and I am stumbling onto a problem. My downstairs toilet has no good way of getting a vent pipe vertically. The wall behind the toilet and one side is a solid log build. The other side has a lot of things in the way and I would rather not try to destroy the...

I wouldn't set it any higher then 135. That's pretty hot lol. 140 is starting to get dangerous, very easy to scald yourself when you start getting into the 140's (I think it only takes a couple seconds at 140 vs a good half minute or longer while in the 130's). This job is a hack because how...

Do you hear that gurgling sound after it is drained or while it is draining? If after it is draining then it almost sounds like it might have an unvented trap and it's basically siphoning the water right out of the trap and that would cause the sewer gases to come back through.

Was some plumbers from another forum with a similar question that I found. After I put the expansion tank in it hasn't done it since. Not sure if its the right fix, but its working. I also notice that I no longer drip out of the BFP, not even a little bit. Before it used to drip here and there...

Yeah I didn't consider the heating side at all because of it being isolated to its own system. The DHW had no expansion tank up until yesterday when I put one in. Jamesplumber06 mentioned that putting an expansion tank after a check valve would put it in its own zone, which I sort of agree...

Yes it has an expansion tank. The heating part of the system is all but isolated from the rest of the system. It cannot go into or out of the system without several components breaking at once. There is no way for excess pressure to go in or out. The line in question is strictly the DHW.

The boiler side is fine. Already tested and haven't had any issues with it beside it taking forever to purge lol. The expansions are 70 psi right now while the pressure is 60 psi. A lot of people said to go 10-15 psi above the working pressure. Not sure of the reason except maybe to give it a...

I've done test after test and I trusted it enough to watch the pressure gauge and I can't get it to surge to more then 75 PSI. No violent shaking still. Not sure where the just under 100 PSI came from. I had my wife turn on and off faucets fast and randomly, and it bounces around from 50-75 PSI...

So the first test went pretty well. I think the expansion tank did what I was hoping, by absorbing part of the initial impact. My pressure gauge did spike to almost 100 PSI though. Is that pretty normal for water hammering? I figure it'll spike at least a little bit. Better then when it was...

Oh sorry about the expansion tank not being secured yet lol. I don't feel that it's heavy enough to cause any problems but in the long haul it will be supported lol. I don't have any more of the brackets though. Going to get them tomorrow.

Sorry I came off a bit confusing. I'll clear up any questions though. Your seeing the setup spot on. That line that goes down and feeds into the boiler is the cold supply for the DHW. It tees off just after the shutoff valve to the auto feed system for the boiler. The caleffi auto feeder has...

Think of my system as the one that you posted except without the recirculating system and an additional hot water heater (but sharing the sams cold water). That's my system right now. My fear of adding a check valve is if I add it before the expansion tank then the expansion tank would relieve...

No recirculation system, yet. The check valve at the boiler is on the heating side (on the auto feed line). There's actually 4 check valves in total lol. One at the boiler itself (it has its own auto feed system) I put in an auto feed as well with a pressure gauge and strainer, but it also has a...

Codes call for the back flow preventer because it can back flow into your drinking water (even though there's a check valve on the boiler too). No codes call for an expansion tank on the tankless water heater but codes did call for it on the tank. It wasn't there when I bought the house a year...

There are several valves installed that the water needs to travel through. They are all quarter turn full port ball valves. There is one on the supply line to the boiler, one before the boiler that has a drain point, one right after the boiler for the hot water supply and one more on the hot...

Weird. Nothing changed on the main line that runs from the wall to those fixtures except for the one tee being capped and a new tee put in a few feet away to supply the boiler. So far it happened with my washer the tenants washer and my sink. I turned the pressure down to 45 psi and I was unable...