Water Heater Installation Mini

^{the instructions may say to discharge into a floor drain, but we all know those go into the drain line in the same way as the dishwasher. It will function if needed..}

^{Test regularly to make sure it doesn't operate like old faithful.}

^{Or cut in a floor drain. ... Ahhhh right}

If the valve opens, where will the hot water go? Is this the sink drain? Will it spray you with hot water if you are over the sink?

Edit, JE my dishwasher drains into the garbage disposal. Is that what you mean?

That sounds dangerous.

It looks like a shorty vent pipe, won't make it a tight seal, just dump....I'm also considering just running the discharge into a stainless steel gallon bucket...

I've never had much luck with those under counter vents. But you could stack a long radius sanitary tee between the sink drain tee and the vent. the long sweep will help direct the water flow.

Also, it looks like your sink drain tee is a standard 90° tee for a cleanout, it should be a sanitary tee.

Now if only you'd explained WTF "TP" stands for.... FFS
Just looked it up... bloody stupid it stands for pressure relief valve gawd only knows why they use TP....
PR would be better...
Get a grip.
I need tea and toast stat... whatever stat means... oh no, I'm in a downward spiral...
I need to go lie in a bath... if only that thread hadn't been broken
Del
(BTW. My undefined three letter abbreviations are ironic)

Thermal Del thermal. (TPRV, PRV, RV, PSV........)

Yeah, but I had my tea and toast

Myth Busters might disagree on the level of danger! I know they rig those things and it's much larger, but still....

Yes.. disable the multiple safety features and just about anything will be dangerous.

I don't recall myth busters plugging floor or sink drains to achieve catastrophic failure..

No fear

.....and you have a RCD or equivalent somewhere in the supply circuit?

Wet room?

Residual-current_device

i wouldn't be concerned about it. I have had water heaters my whole life and have seen a pressure relief valve pop once and that was because it was faulty. I ran concessions for Cleveland Stadium years ago and we had about 50 water heaters. never tied a relief valve to anything and never had an issue.

Yeah I think I'm just going to dump in a small bucket and put a water alarm in the bottom...I had a bad pressure relief valve once and never knew it was leaking until I got a high water bill....so learn from the past....I found a good deal on these alarms...3 for $20

The TP valve is the air bag, the drain is the seatbelt.

The bucket is like cutting you're seatbelt off and bracing for impact with two broken arms.

...if that sounds reasonable.. go for it

I've put these in before, and the trick is to run the PT line high up and then back down to the drain pipe. Get a section of drainpipe designed for the overflow of a filter system or dishwasher and connect to that.

You want the PT line running high up under the counter before it goes back down to the drain so that you prevent the sink from being filled and then drained back to your clean water source. You do the same thing with a dishwasher drain if you are not using an air gap, even though the dishwashers today have a check valve.

Here are some pipe adaptors:

https://www.gamurdock.com/gam/out/GROUPS/Drain-Products-Drain-Connections.htm

You brought up a valid point about the air gap in the system. SE is going with a 2gal. can and water alarm. But, if he does have an event where there is a relief from the PT valve, that 2gal can is going to overflow- with or without an alarm, he'll have a mess to clean up and possible cabinet repair/ replacement from water damage. Particle board does not fair well with water.

That's my 2¢ worth

Not so, as we are talking incompressible fluid here, a very tiny amount will reduce the pressure built up by thermal input. If valve is in good condition, it will reseat.

Very true, I've seen these pop, very little water comes out, mostly steam....It then reseats, or continues to leak a trickle, in either case a 1 gal bucket is more than enough volume and the alarm adds viability...and I might add that this is the recommended alternative to a floor drain...

..."In recent years, many water heater manufacturers have relocated TPR valve openings. They have moved them from the top to the side of the tank. When older heaters are replaced with similar height units, installers occasionally will turn the valve so it can be realigned with the original discharge pipe that extends from the wall. This often results in the trapping of the valve, preventing it from draining by gravity. If the valve drips, mineral deposits can collect at the opening and create a mineral plug. This can restrict or block the opening altogether. Neither the TPR valve nor the discharge piping should ever be trapped and should always drain completely by gravity. "...

So,,,no...and also it's against code to make a sealed connection from the relief valve discharge to any drain line used in plumbing....You can't tie into existing plumbing connections for the house, and you can't trap the discharge line....You can make a dump into a vent line but not a sealed connection...

http://www.ashireporter.org/HomeInspection/Articles/The-Temperature-Pressure-Relief-Valve/1568

Since you are in florida where it does not freeze, 3/4" pipe from your relief valve slightly down hill to a hole going outside ( under k.s. ) then turn a 90 degree elbow downward just outside. They are called safety relief valves for a very good reason. The water heater is hooked up to house pressure 50 lbs of so, so you must pipe the relief valve properly. Outa sight Out of mind until you come home to flooded floors. If you notice a drip outside, replace T&P valve. Also make sure you put a cold water shut off valve leading to your water heater. Good luck. Just be aware that water heater installations are done under a plumbing code, and the code "protects the health of the nation".

Came across this, how the water heater working out, I’m thinking about putting one in one of my guest houses. Need a calendar for the water to get hot.

any issues?