We need to replace our water heater, and are considering a Rinnai Tankless water heater. The household is two adults living in Minnesota. So, the temperature rise would typically need to be 70 degrees. The biggest draw in the house is a soaking tub. This would be the only thing drawing hot water when in use.
I see that Rinnai has two models, 2532FFU and 2520FFU. Looking at their charts, both units perform the same after you have to heat water
60-65 degrees or more. Are there any real world advantages to the 2532FFU? Does anyone have experience with these units that lives in my neck of the woods? What kind of maintenance is needed on these systems?I notice that Rinnai recommends a 3/4 NG supply. The plumber that came out to take a look at our setup, said that my existing lines will work fine. There is currently a 'main' line in our utility room. He said they have installed units in the area without having to change the NG lines. What are the possible ramifications of using the smaller NG line?
Anything else I should know before making a decision?
Thanks for any feedback,
Steve