Tankless Technical Bulletin

Vertical Venting - Zero Clearance - Demand Pumps

Vertical Venting

In the past, we required to have a horizontal offset and a form of condensation collector (in-line or condensate tee) for any of our Tankless water heater installations terminated with vertical vent configuration. Effective with this notice Rheem will allow a straight vertical vent run off the top of the water heater provided that a vertical condensate collector, as designed by the appropriate vent manufacturer, is installed as close to the tankless water heater as possible. All other considerations, clearances, and installation requirements as outlined in the Use and Care Manual must be met.

See our Tankless Application Drawing RTG11171 and RTG11172 for information and suggested components.

Zero Clearance DV Venting

Previously, Rheem has required a one (1) inch clearance around concentric vent piping to combustible surfaces for our tankless water heaters. Through testing we have certified that a clearance of zero (0) inches is acceptable to combustible and non-combustible surfaces. Effective with this notice a clearance of zero (0) inches to combustible and non-combustible surfaces for our Direct Vent (DV) concentric venting for our RTG-66 and RTG-53 Series Direct Vent water heaters is acceptable.

Typical 66DV

Vertical Installation

Demand Pump Systems

While we have allowed return circulation with our tankless products, we have in turn reduced the warranty of those products in installations where water is re-circulated through the tankless unit. These types of applications typically include hot water on demand plumbing system composed of a return circulation loop and a high flow pump. These types of systems can put undo stress on a tankless water heater and dramatically shorten the life expectancy of the unit, thus we reduce the applicable warranty under those conditions.

In consideration of these types of applications, and seeing more and more tankless water heaters being installed under these circumstances, it is our recommendation that only a Demand Pump System be used. This is a pump system that works via a push button or motion detector that will activate a small high flow pump for a short duration to bring hot water from the tankless unit to the desired fixture location. These pumps typically include some circuitry to limit the amount of operation time, not a timer, and have an integrated thermostat that will shut off the pump when the hot water reaches the fixture. There are several different brands and manufactures of such systems, the use of these systems with a Rheem Tankless Water Heater will not impact or affect the warranty. A system that uses a timer to control the operation is NOT considered a demand pump. Any other recirculation system, continuous, timer, thermostatic, domestic heat, or any application where the water is re-circulated through the tankless water heater, will reduce the warranty of the Rheem Tankless Water Heater to 3-Years on the heat exchanger and parts.

See our Tankless Application Drawing RTG11154 for information.

In keeping with its policy of continuous progress and product improvement, Rheem reserves the right to make changes without notice.

Rheem Water Heating 101 Bell Road Montgomery, AL 36117-4305 www.rheem.com

Tankless water heaters

Endless hot water

07/08 TKTB-104

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Rheem TKTB-104 warranty Tankless Technical Bulletin, Vertical Venting, Zero Clearance DV Venting, Demand Pump Systems
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TKTB-104 specifications

The Rheem TKTB-104 is a high-efficiency tankless water heater that has gained popularity for its ability to provide endless hot water while also being energy efficient. Designed for both residential and commercial use, this unit can meet the demands of multiple bathrooms and appliances simultaneously.

One of the main features of the Rheem TKTB-104 is its on-demand heating technology. Unlike traditional water heaters that continuously heat water, thereby wasting energy, this tankless model only heats water as it is needed. This means users can enjoy a continuous supply of hot water without running out, making it ideal for large families or homes with high hot water usage.

In terms of energy efficiency, the TKTB-104 boasts a high Energy Factor rating, significantly reducing energy consumption and lowering utility bills. The unit is equipped with advanced condensing technology, which captures and utilizes exhaust gases to preheat incoming water, maximizing efficiency. Rheem also incorporates a modulating gas valve that adjusts the flame based on hot water demand, providing precise control and optimal energy usage.

The Rheem TKTB-104 is constructed with durable materials designed to withstand the test of time, ensuring longevity and reliability. It features a compact design, allowing for easy installation in tight spaces such as utility rooms or closets. The unit can be installed both indoors and outdoors, providing flexibility for homeowners to choose their preferred location.

Another notable characteristic of the TKTB-104 is its built-in digital display. This feature allows users to easily monitor the temperature settings and operational status of the unit. The advanced self-diagnostic system further aids in maintenance by providing alerts for any potential issues, ensuring that the heater operates at peak performance.

Safety is also a top priority for Rheem. The TKTB-104 includes multiple safety features, including a flame sensor, overheat protection, and safety shut-off capabilities, providing peace of mind for users.

With a maximum output of 199,000 BTUs, the Rheem TKTB-104 is a powerful solution for meeting hot water needs efficiently. Its combination of advanced technologies, energy-saving features, and robust construction make it a top choice for those looking to upgrade to a tankless water heater.
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