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Thanks Wayne and yes it makes sense that the 125 T/P relief valve really only handles an emergency pressure situation. Due to distance from the tank. Thanks for the detailed breakdown. But since over pressure is the most common reason in my area (we often get fluctuations from our utilities)...

The Primary valve is located within 24" of the water heater. I would think the pressure at least would transfer. But I do see your point and it's a good one.

Thanks for having a look. Much appreciated. But for the life of me I can't find it written anywhere in the UPC code book.

Somewhere long ago I learned to install a Primary/Secondary T/P valve system when it wasn't possible to direct the T/P vent pipe down from the valve provided on the water heater. The existing conditions: The relief valve on the HWH was below the ground level that existed outside the building...

Does the low temp exhaust through PVC mean a standard neoprene roof vent can be used? I'm installing a condensing Noritz tankless vent (PVC sch 40 solid core) through a composite roof and would love to simply install the same neoprene flashing that I use for plumbing air vent terminations.

Great. Thanks for the confirmations. Yes I like the design and didn't want to have to go back into that frigging crawl space again.

I'm roughing in a 3" toilet drain and want to install a 3x2 wye on the vertical drop, above where the drain turns horizontal. Is this allowed per UPC? I can't seem to find it in the code book.

Yep, the factors you list are the ones I'm concerned about but never got a straight answer on it. I'll do the recirc. Safer is better.

Appreciate the calcs. Very helpful.

Hey thanks for the hard earned advice. Best kind...

I'm choosing whether or not to install a recirculation pump for a standard 50 gallon tank type electric water heater in a one story building, residential. I'd like to start working with 1/2" home runs to fixtures using a distribution block. I'm wondering if this will eliminate the need for a...

Well I see your point but I've been designing and installing for many years and I still have questions. For example: What is the expected wait time for hot water to reach it's point of use with a 1/2" PEX home run from a manifold? I'd like to be able to calculate when it makes sense to install a...

I'm a plumber looking for an excellent plumbing design/layout text book or manual. Specifically, I'm looking for one with cold/hot water piping drawings/specs for various systems including recirc/manifold distribution etc.

Thanks. I've installed recircs at the water heater, at point of use and recently I installed a sensor activated system which works with a pump at the water heater and motion sensors in the bathroom and kitchen (certified water sense system). My customers love the pumps but I'm feeling like I may...

What's a good rule of thumb for when to install a recirc line in a new construction project. In other words, what is the minimum length from water heater to farthest fixture that will probably require a recirc. The point is to not over engineer.

I'm roughing in the drain for a commercial dishwasher for a small restaurant in King County Washington. My question is should I install a floor sink. That seems to me to be the best way although is it overkill? Should I simply install an indirect drain funnel type...i.e. 2" trap with 2"x3"...