Most pex manufacturers require 18″ of pipe distance from the heat source (boiler or water heater), their theory being the potential for temperatures above the tubing rating would be greatest in the first 18″.
Is PEX OK for boiler?
Q: Can PEX pipe be used for installation of an outdoor wood boiler or furnace? A: Yes. 1″ oxygen barrier PEX is most common for the job. For non-pressurized boilers, PEX piping without O2 barrier can be used.
How close can PEX be to water heater?
The Uniform Plumbing Code (UPC 604.13) states that “PEX tubing shall not be installed within the first 18 inches of piping connected to a water heater.” But the UPC is not used in all jurisdictions.
How close can a plastic pipe be to a boiler?
1000mm
Plastic pipework is allowed to be used on oil boilers, provided there is at least 1000mm copper pipe connection to the boiler before any plastic. Plastic pipework may also be used on under floor heating systems in conjunction with a blending valve.
Can PEX pipe be connected to hot water heater?
PEX tubing may be connected directly to residential electric tank or tankless (instantaneous) water heaters, if the local code and manufacturer’s instructions allow. When connecting PEX tube to gas tank or tankless water heaters, the tube must be kept at least 6 inches away from the exhaust vent of the heater.
Is Blue PEX OK for hot water?
Color-Coded: Red PEX pipes can be used for hot water supply lines, blue PEX for cold water supply, and white for either hot or cold.
Where should you not use PEX?
PEX can’t be installed in high heat areas.
You can’t install PEX in high heat areas like near recessed lighting. This also means you can’t connect PEX directly to a hot water heater, but you can use a connecting material to do this.
Can you use PEX on a gas water heater?
The Pex piping is rated by code, to withstand the 210 °F temperatures for up to 48 hours. However, national code does not allow for PEX to be used within 18 inches of the water heater.
What is the max temp for PEX tubing?
180°F
2) 180°F is the maximum fluid temperature for PEX tubing.
As the temperature increases the max operating pressure drops. Most PEX tubing will be rated for: 160 psi at 73°F.
Can PEX be used for water heater pressure relief valve?
Can you use PEX as discharge pipe at water heater temperature and pressure relief (TPR) valve? Yes. PEX (cross-linked-polyethylene) is rated for water distribution by the International Residenital Code (IRC) at Table P2906.
Can you use SharkBite on pressure relief valve?
The SharkBite NCLX-5LX T&P relief valve is designed to relieve at 210°F and 150 psi. This temperature and pressure exceeds the temperature/pressure limits of PEX tubing. For this reason, this valve is not compatible with PEX tubing.
What size PEX should I use?
In general, the greater the distance from the manifold to the fixture, the wider the PEX tubing should be. A 3/8-inch line is sufficient for lengths up to 250 feet; 1/2-inch line will deliver adequate water pressure up to 350 feet; and 3/4-inch tubing is necessary to run a 500-foot line.
What is a TPR extension?
Temperature/pressure-relief or TPR valves are safety devices installed on water heating appliances, such as boilers and domestic water supply heaters. TPRs are designed to automatically release water in the event that pressure or temperature in the water tank exceeds safe levels.
Where should a pressure relief valve be located?
A temperature pressure relief valve is a valve that’s located somewhere near the top of your water heater. The valve has a lever that can be lifted up or down and a discharge pipe that runs from the valve straight down to the bottom of your water heater.
Can you use PVC on TPR valve?
Can you use PVC pipe for the water heater temperature pressure relief (TPR) discharge pipe? No. PVC pipe is not rated by the building code for use with hot water, so the installation shown above is wrong and unsafe.
Can pressure relief valve drain into pan?
The terminal end of the pipe shall not be threaded. Discharge from a relief valve into a water heater pan shall be prohibited.
Can a pressure relief pipe go up?
This tube should be aimed straight to the ground and never go up. This is because hot water will come out of the TPR valve as it releases water. Therefore, extremely hot water should discharge to the ground for safety. Additionally, if a pipe were to go up, water will have to work against gravity to empty.
What size line should you run to the relief valve on residential water heater?
The discharge tube attached to the water heater pressure/temperature relief valve should be the same diameter as the opening of the valve itself. In our photo someone has fastened a 1/2″ pipe discharge tube onto a 3/4″ diameter relief valve.
