Absolutely the best hot water heater.
Rinnai Hybrid Tank-Tankless Water Heater - https://www.rinnai.us/hybrid-tank-tankless-water-heater
Bought at Lowes for a very good price.
Rinnai Hybrid 40-GPM 87300-BTU 1-Year Limited Liquid Propane Hybrid Water Heater
Recently installed this hot water heater, 5 people in the house and it keeps up, have done laundry, dish washer and showers simultaneously and one after the other, so far, it's awesome !
Installed exactly where the old electric was, and was simpler than a "true tankless" hot water heater, which would have required re-doing propane regulator, cutting ceiling / floor joist to route intack and exhaust, re-routing water lines, hang hooded thing on outside of house to cover intake and exhaust and the hyprid was only 700 more than a regular hot water heater, so cheaper too, installation cost is / was the same as regular hot water heater.
We'll see how long it holds up, and the long term cost difference between propane vs. electric, but so far this thing is good, and no longer have to time our showers, do dishes or wash around who wants to shower !