Thread: WH TPR to floor drain

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I agree. The TPR should be plumbed outside of the house. Hot water venting inside the home is not acceptable to me. Nor is venting the TPR to a crawl space or basement.

See #2 & #5
Is it one or the other? How could it be both? Is #5 just for freezing climates?
Anybody got '06 commentary?

P2803.6.1 Requirements for discharge pipe.

The discharge
piping serving a pressure-relief valve, temperaturerelief
valve or combination valve shall:
1. Not be directly connected to the drainage system.
2. Discharge through an air gap located in the same
room as the water heater.
3. Not be smaller than the diameter of the outlet of the
valve served and shall discharge full size to the air
gap.
4. Serve a single relief device and shall not connect to
piping serving any other relief device or equipment.
5. Discharge to the floor, to an indirect waste receptor
or to the outdoors. Where discharging to the outdoors
in areas subject to freezing, discharge piping
shall be first piped to an indirect waste receptor
through an air gap located in a conditioned area.
6. Discharge in a manner that does not cause personal
injury or structural damage.
7. Discharge to a termination point that is readily
observable by the building occupants.
8. Not be trapped.
9. Be installed to flow by gravity.
10. Not terminate more than 6 inches (152 mm) above
the floor or waste receptor.
11. Not have a threaded connection at the end of the piping.
12. Not have valves or tee fittings.
13. Be constructed of those materials listed in Section
P2904.5 or materials tested, rated and approved for

Originally Posted by Richard Stanley

See #2 & #5

Is it one or the other? How could it be both?

2. Discharge through an air gap located in the same
room as the water heater.

5. Discharge to the floor, to an indirect waste receptor
or to the outdoors. Where discharging to the outdoors
in areas subject to freezing, discharge piping
shall be first piped to an indirect waste receptor
through an air gap located in a conditioned area.

Richard,

It is not 2) *or* 5), it is 2) *and* 5).

First, it must discharge through an air gap located in the same room as the water heater.

Second, that discharge (from the air gap device) may go to any of the locations listed in 5).

I see it now - thanks.
So this means that the drain can no longer be piped directly to the exterior.

P2803.6.1 Requirements of discharge pipe.
The outlet of
a pressure relief valve, temperature relief valve or combination
thereof, shall not be directly connected to the drainage
system. The discharge from the relief valve shall be piped
full size separately to the outside of the building or to an indirect

waste receptor located inside the building.......The discharge shall be installed in a manner that does not cause personal injury or property damage and that is readily observable by the building occupants

Originally Posted by Richard Rushing

P2803.6.1 Requirements of discharge pipe.

The outlet of
a pressure relief valve, temperature relief valve or combination
thereof, shall not be directly connected to the drainage
system. The discharge from the relief valve shall be piped
full size separately to the outside of the building or to an indirect

waste receptor located inside the building.......The discharge shall be installed in a manner that does not cause personal injury or property damage and that is readily observable by the building occupants

Richard,

Your post is from the 2003 IRC. Here is the full text of THAT section.

P2803.6.1 Requirements of discharge pipe.

The outlet of a
pressure relief valve, temperature relief valve or combina-
tion thereof, shall not be directly connected to the drainage
system. The discharge from the relief valve shall be piped
full size separately to the floor, to the outside of the building
or to an indirect waste receptor located inside the building. In
areas subject to freezing, the relief valve shall discharge
through an air gap into an indirect waste receptor located
within a heated space, or by other approved means. The dis-
charge shall be installed in a manner that does not cause per-
sonal injury or property damage and that is readily observ-
able by the building occupants. The discharge from a relief
valve shall not be trapped. The diameter of the discharge pip-
ing shall not be less than the diameter of the relief valve out-
let. The discharge pipe shall be installed so as to drain by
gravity flow and shall terminate atmospherically not more
than 6 inches (152 mm) above the floor. The outlet end of the
discharge pipe shall not have a valve installed.

Richard Stanely's post of that section is from the 2006 IRC. Here is the full text of THAT section.

P2803.6.1 Requirements for discharge pipe.

The discharge
piping serving a pressure-relief valve, temperature relief
valve or combination valve shall:
1. Not be directly connected to the drainage system.
2. Discharge through an air gap located in the same
room as the water heater.
3. Not be smaller than the diameter of the outlet of the
valve served and shall discharge full size to the air
gap.
4. Serve a single relief device and shall not connect to
piping serving any other relief device or equipment.
5. Discharge to the floor, to an indirect waste receptor
or to the outdoors. Where discharging to the outdoors
in areas subject to freezing, discharge piping
shall be first piped to an indirect waste receptor
through an air gap located in a conditioned area.
6. Discharge in a manner that does not cause personal
injury or structural damage.
7. Discharge to a termination point that is readily
observable by the building occupants.
8. Not be trapped.
9. Be installed to flow by gravity.
10. Not terminate more than 6 inches (152 mm) above
the floor or waste receptor.
11. Not have a threaded connection at the end of the piping.
12. Not have valves or tee fittings.
13. Be constructed of those materials listed in Section
P2904.5 or materials tested, rated and approved for
such use in accordance with ASME A112.4.1.

Notice the differences, they are many and they are great.