Thermal Expansion, Water Supply Connections

Operating Instructions Installation Instructions Safety Instructions

Installing the water heater.

Thermal Expansion

Determine if a check valve exists in the inlet water line. It may have been installed in the cold water line as a separate back flow preventer, or it may be part of a pressure reducing valve, water meter or water softener. A check valve located in the cold water inlet line can cause what is referred to as a “closed water system”. A cold water inlet line with no check valve or back flow prevention device is referred to as an “open” water system.

As water is heated, it expands in volume and creates an increase in the pressure within the water system. This action is referred to as “thermal expansion”. In an “open” water system, expanding water which exceeds the capacity of the water heater flows back into the city main where the pressure is easily dissipated.

A “closed water system”, however, prevents the expanding water from flowing back into the main supply line, and the result of “thermal expansion” can create a rapid and dangerous pressure increase in the water heater and system piping. This rapid pressure increase can quickly reach the safety setting of the relief valve, causing it to operate during each heating cycle. Thermal expansion, and the resulting rapid and repeated expansion and contraction of components in the water heater and piping system can cause premature failure of the relief valve, and possibly the heater itself. Replacing the relief valve will not correct the problem!

The suggested method of controlling thermal expansion is to install an expansion tank in the cold water line between the water heater and the check valve (refer to the illustration below). The expansion tank is designed with an air cushion built in that compresses as the system pressure increases, thereby relieving the over pressure condition and eliminating the repeated operation of the relief valve. Other methods of controlling thermal expansion are also available. Contact your installing contractor, water supplier or plumbing inspector for additional information regarding this subject.

Water Supply Connections

Care and Cleaning

NOTICE: Do not apply heat to the HOT or COLD water connections. If sweat connections are used, sweat tubing to adapter before fitting adapter to the water connections on heater. Any heat applied to

Refer to the illustration below for suggested typical installation. The installation of unions or flexible copper connectors is recommended on the hot and cold water connections so that the water heater may be easily disconnected for servicing if necessary. The HOT and COLD water connections are clearly marked and are 3/4″ NPT on all models. Install a shut-off valve in the cold water line near the water heater.

Typical Installation

Troubleshooting Tips

the water supply fittings will permanently damage the dip tube and/or heat traps.

Vacuum Relief Valve

(Not Supplied)

If required, install per local codes

and valve manufacturer’s

instructions.

Temperature and pressure relief valve

Union

R	V		LV	COLD
		A
E			E
	LI	E
			F
	HOT

To electrical distribution panel

Heat trap

6″ minimum

To cold water supply

Shut-off valve

Thermal expansion tank (if required)

Heat trap 6″ minimum

Hot water outlet to fixtures

Anode		Electrical junction box

		(use only copper conductors)

Jacket access panel

Customer Service

		Jacket access panel
	Relief valve discharge line	Auxiliary catch pan
	to suitable open drain	Auxiliary catch pan
	to suitable open drain	2″ maximum
		2″ maximum
6	6″ air gap

Drain valve

HE Series, PE Series, GE Series, SE Series specifications

Rheem, a prominent name in heating and cooling solutions, offers a variety of water heating systems that cater to different needs and preferences. Among its popular product lines are the SE Series, GE Series, PE Series, and HE Series. Each series boasts unique features, advanced technologies, and distinct characteristics aimed at enhancing efficiency and user satisfaction.

The Rheem SE Series is renowned for its robust performance and reliability. This series encompasses energy-efficient models designed to provide optimal hot water output while minimizing energy consumption. Key features of the SE Series include a durable construction that guarantees longevity, as well as advanced temperature controls that enhance user convenience. The series often includes smart technology options that allow users to monitor energy usage, making it ideal for tech-savvy homeowners looking for efficiency without compromising on comfort.

Next is the GE Series, which aligns modern design with robust technology. The GE Series is particularly noted for its compact size, making it suitable for installations in confined spaces. This series also emphasizes energy efficiency, often featuring heat pump technology that significantly reduces electricity consumption while providing excellent heating performance. GE Series units come equipped with Wi-Fi connectivity, allowing for remote management and monitoring, which is increasingly important in a digitally connected world.

The Rheem PE Series stands out for its environmentally friendly approach. Utilizing advanced heat pump technology, this series not only provides efficient water heating but also contributes to reduced greenhouse gas emissions. The PE Series is notable for its low operational costs, especially in moderate climates, as it harnesses ambient heat to heat water. Additionally, its user-friendly digital interface simplifies temperature adjustments and monitoring, ensuring that users can enjoy comfortable water temperatures effortlessly.

Lastly, the HE Series combines high performance with exceptional energy efficiency. This series is designed for maximum output, ideal for larger households that require a substantial amount of hot water. HE Series models often incorporate cutting-edge insulation techniques, minimizing heat loss and enhancing overall efficiency. Additionally, these units are engineered for quiet operation, ensuring that they don’t disrupt daily life. With features like advanced diagnostic tools and user-friendly controls, the HE Series stands out as a reliable option for families seeking quality and performance in their water heating solutions.

In summary, Rheem’s SE, GE, PE, and HE Series water heaters offer diverse options, each with particular strengths suited for different user needs. Whether it's energy efficiency, sleek design, environmentally friendly technology, or high performance, Rheem delivers innovative solutions in the water heating market.

Rheem HE Series, SE Series Thermal Expansion, Water Supply Connections, Typical Installation

Models: HE Series PE Series GE Series SE Series