WARNING: The water heater should not be installed in a space where liquids which give off flammable vapors are to be used or stored.

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 (see 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.

Safety Instructions Installation Instructions Operating Instructions

IMPORTANT: 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 cold water connections on heater. Any heat applied to the cold water supply fittings will permanently damage the dip tube.

5 feet

from the

ground

minimum

Water Supply Connections

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 3/4NPT on all models. Install a shut-off valve in the cold water line near the water heater.

Typical Installation

Vent connector

 

 

 

Pitch up 1/4

Union

 

to chimney

 

per foot

 

 

 

 

 

 

 

 

Heat trap

 

 

 

 

 

Draft hood

6minimum

 

 

 

 

 

Anode

 

 

 

 

 

 

Hot water outlet

HOT

 

 

 

 

Union

F E I L E

R

 

 

 

to fixtures

 

 

 

COLD

 

 

 

 

 

L A

V

 

 

 

 

E V

 

 

 

Temperature and

 

 

 

 

 

 

pressure relief valve

 

 

 

 

 

 

Manual gas shut-off

 

 

 

 

 

Heat trap

 

Shut-off

 

6minimum

 

 

 

 

 

 

 

To gas supply

 

 

 

valve

 

To cold water

 

 

 

 

 

 

supply

Ground joint union

 

 

 

 

 

Shut-off valve

Sediment trap

 

 

 

 

Thermal expansion

 

 

 

 

tank (if required)

 

 

 

 

 

Cap

 

 

 

 

 

Relief valve

 

 

 

 

Drain

discharge line to

 

 

 

 

 

 

 

 

 

 

suitable open drain.

Thermostatic gas valve

 

 

 

 

valve

 

 

 

 

 

 

 

 

 

 

 

Jacket door

 

 

 

 

 

 

Care and Cleaning Troubleshooting Tips Customer Service

6air gap

9

Auxiliary catch pan

Page 9
Image 9
Rheem HG installation instructions Thermal Expansion, Water Supply Connections, Typical Installation

HG specifications

Rheem HG is a groundbreaking water heating solution designed to meet the needs of modern households and commercial spaces. Known for its efficiency and reliability, the Rheem HG product line integrates advanced technologies and innovative features, making it a standout choice in the competitive water heater market.

One of the primary features of the Rheem HG series is its energy efficiency. With an impressive Energy Factor (EF) rating, these water heaters utilize cutting-edge heat pump technology to extract heat from the air, significantly reducing the amount of electricity required to heat water. This efficient operation not only leads to lower utility bills but also contributes to environmental sustainability.

The Rheem HG series is equipped with smart technology, allowing users to monitor and control their water heating system remotely. Through a user-friendly mobile app, homeowners can adjust temperature settings, receive maintenance alerts, and track energy usage, ensuring optimal performance and peace of mind. This connectivity feature exemplifies Rheem’s commitment to integrating the latest smart home technologies into its products.

In addition to energy efficiency and smart features, Rheem HG is designed with durability in mind. Built with high-quality materials, these water heaters are resistant to corrosion and have extended warranties that reflect their reliability. The innovative construction also includes advanced insulation, which minimizes heat loss, ensuring that hot water is readily available whenever needed.

Another significant characteristic of the Rheem HG series is its versatility. Available in various sizes and capacities, these water heaters can accommodate the hot water demands of different households, from small apartments to larger homes. The flexibility in installation options, including both indoor and outdoor configurations, makes it easier for homeowners to find a solution that fits their specific requirements.

Safety features are paramount in the design of the Rheem HG series. Equipped with advanced leak detection systems, automatic shut-off mechanisms, and enhanced temperature control, these water heaters prioritize the safety of users while delivering consistent performance.

In summary, Rheem HG represents a fusion of energy efficiency, modern technology, durability, versatility, and safety. With its commitment to innovation and sustainability, Rheem continues to be a leader in the water heating industry, providing solutions that cater to the evolving needs of today’s consumers. Choosing a Rheem HG water heater not only guarantees high performance but also supports a greener future.