1. Reply. [deleted] • 1 yr. ago. Turn on a cold tap closest to the tankless for a few minutes then measure the water temp. Let's assume 65 degrees. See what the water heater is set at. Let's assume 120 degrees. You have a 55 degree temp rise which puts you at 2.24gpm max on the tankless.1. Reply. [deleted] • 1 yr. ago. Turn on a cold tap closest to the tankless for a few minutes then measure the water temp. Let's assume 65 degrees. See what the water heater is set at. Let's assume 120 degrees. You have a 55 degree temp rise which puts you at 2.24gpm max on the tankless.Where is the filter on the rheem retex-18 electric water heater. See all answers. Replies 0. If the light on front of heater won’t come on .How do I trouble shoot ? See all answers. Add instruction Order instruction Similar Devices. Rheem XG30T06MD30U1; Rheem XG50T12DM40U0W; Rheem E85-24-G 208 Volt 3 Phase;Rheem is here to help! United States . 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Contractor's Assistant: I understand that your Rheem retex 18 water heater is only producing lukewarm water, even though it is set to 140°F. Is that correct? Yes. Contractor's Assistant: Have you noticed any changes in the water temperature recently, or has it always been lukewarm? Changed recently tried resetting multiple times at the ...How do i trouble shoot? Rheem ‎RTEX-18. MansIo Mans.Io. Contacts; Forum; Vra 'n vraag. Meld aan. Met login en wagwoord. Of meld aan via sosiale netwerke. Teken aan Meld aan. ... Where is the filter on the rheem retex-18 electric water heater. 11 maande gelede ...How do you turn up the temperature on the Rheem Retex-06. See all answers. Add instruction Order instruction Similar Devices. Rheem G82-156 NG MA; Rheem ECOH180XLN-2; Rheem ELDS30-C 480V 4.5kW; Rheem ES50-15-G-1 240 Volt 3 Phase; Rheem MELD105-TB 480 Volt 12 kW; Random Discussions. Replies 0.Model # RETEX-18. Store SKU # 1002624315. Rheem. ... For screen reader problems with this website, please call 1-800-430-3376 or text 38698 ...3 2- SELECTING A LOCATION TO INSTALL This product is designed to be installed indoors only. DO NOT install this product in a location where it may be subjected to freezing temperatures. If the water inside your tankless water heater freezes, it can cause severe and permanent damage that is not coveredRheem tankless water heaters provide water on demand. However, even the best tankless water heaters sooner or later may stop working or be affected by other kinds of problems. 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