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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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