The standard tankless heaters do not heat water to any given temp. They only work by temp-rise. The standard 120 F thermostat setting has nothing to do with how hot the water is actually heated.
If you've got 45 F degree well water (like all my houses have)- that Rheem will only raise the temp of the water by 20 F at full capacity (2.5 GPM). That means - if you've got cold well water - your "hot" water will be 65 degrees F instead of 45 F. If you only run your water at 1 gallon per minute, you get a 40 F rise. Much better for small usage and worthless for high flow (like taking a shower?).
What the heck is happening to your old failed heaters? I rarely buy new. I buy used - usually $50 for gas or electric and I've rarely ever had one go bad. I did have to fix a few with minor issues. I've got four houses - all with used tank heaters and some have been in use for 30 years.
Note also that standard tankless heaters do not work with preheated water. If you heat your water in the summer with solar, or in the winter with a wood fire - standard tankless heaters can't be used. There are special and more expensive models made for that.
A well insulated tank heater is just as efficient as a tankless - and cheaper - and it actually keeps hot water on hand.
Rheem RTE 7 Indoor Series Electric Water Heater Required Breaker – 30, 240 volts Maximum Flow Rate - 2.5 GPM Heats with 20 F rise at 2.5 GPM, 40F rise at 1.2 GPM, 90F at .5 GPM
Rinnai Model Number REU-VB2020FFU-US 15,000 - 150,000 Btu/h (Natural Gas and Propane) Hot Water Capacity 0.6 to 5.3 GPM Gas supply: 3/4 inch MNPT Cold water inlet: 3/4 inch MNPT Hot water outlet: 3/4 inch MNPT Efficiency 82% Temperature rise at 5.3 GPM is 40 degrees F, 125 F at 2 GPM
Rinnai Model Number REU-VB2528FFUD-US Hot Water Capacity 0.4 to 7.5 GPM (40° F rise) Propane: 82% Residential: 98°F - 140°F 10,300 - 180,000 BTU/h (Propane) Gas supply: 3/4 inch MNPT Cold water inlet: 3/4 inch MNPT Hot water outlet: 3/4 inch MNPT
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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