Rheem RETEX-13 Performance Self-Modulating 1.97 GPM Electric Tankless Water Heater

I bought 1 year ago and everything is perfect, money saver

I would give this a 5 star review but I have a problem with tub spout water temperature. Overall I really like this unit. The water temp on all the faucets in the house is great, except for the tub spout. The shower is a nice 125F but the tub spout is only around 99F. The specs say a max of 4 GPM, but for my area the max is only 1.7. GPM based on winter water temp (this is how the Rheem support person said they rate these). This Information is not provided in anywhere in their documentation and you need to call them to see what they rate your winter water temp in your area. The max flow of the water heater is 4 GPM, but the tub spout is 5 GPM. From all the research I have done, no plumbing manufacturers limit the flow on tub spouts. So with the smaller water heater, you will not get enough hot water from the tub spout to fill the tub at the same temp as the shower head. I would not have bought this unit if I knew this in advance. My options at this point are: 1) live with it, 2) upgrade my new water heater (check the wiring/breaker requirements), 3) change the newly installed single handle shower valve to one that adjusts water volume and temperature separately and risk that the lower gpm out of the spout can fill the tub at a speed fast enough before the water in the tub gets cold. Be aware of this if you buy the small unit.