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let the pressure off and bleed it down below the valve and plug it. Dont plug the relief valve by accident.

doesnt look like it meets code to me either. Washer is 2" laundry sink 1 1/2. the reason is because the 1 1/2 drain needs the sink to take the excess water until the drain can catch up to the volume of water.

rheem doesnt put vacuum relief valves on water heaters. They are "only" used when installing heaters on upper floors.

poly is 250 psi and a lot thicker than pex bury a 14 g wire with whatever you do so its traceable.

you can add a union to connect manifolds like that using brass fittings

If you open the zone valves one at a time you can tell what gets hot. you have to close the valves on the right in the photo for the 3 zones you are not working on and shut off the boiler feed. cant tell which zone it is from a photo I write in marker on the copper which valve does what. ie...

dont worry about minerals...If your temp is too high you need to get your boiler serviced soonedr than a month from now the valve thats leaking is a pressure temp valve and its the safety on your system. but your temp control on your boiler is malfunctioning which results in high temp and...

also you have no backflow preventer

Is your circulating pump working? Hitting 270 is dangerous. Do you have heat? The knocking sound could be air in the lines or if its coming from the boiler... boiling water with no where to go. does it work if you manually open the zone valves?

what brand and model is the heater?

good concise response nice job

1 1/2 polybut available at plumbing supplies 200 psi

ball valve

Late on this but my helper and I both have rinnais. On tankless I do rinnai if on outside wall and navien if its not.

That heater uses stranded wire and if one strand touched ground it could blow up the elements base. Dont ask me how but stuff happens. I wouldnt change the heater i would just add a new element. water pressure has nothing to do with the electrical aspect.

tie it in above the flood level rim of the lav that goes with that water closet.

you should have mentioned in your first post you had galvanized pipe

my sons well was 250 down and we pulled it by hand. slimey is the word. its hard to hold on to but definately pullable. we wiped off the slime as we pulled it up which made putting it back down easier. We had no idea it was going to be that deep but once you start you cant stop. We used...

the rules for condensate drainage were vague for years. officially they are supposed to be above the trap. It looks like the plumber knew what he was doing. If you cut in a 3/4 trap on the drip line the smell will disappear. its a $2 fix unless you dont have the glue. im not sure the hvac...

You have 10 15' sections of ridgid cable? try to sell it and get the right cable