Rheem Water Heater TKTB 104 User Guide

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.  
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  
Vertical Installation under those conditions.  
In consideration of these types of applications, and seeing more and more tankless water heaters  
Typical 66DV  
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.  
Tankless water heaters  
Endless hot water  
Rheem Water Heating  
101 Bell Road  
Montgomery, AL 36117-4305  
07/08  
TKTB-104  
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