Just installed 2 x Rinnai R98lsing with commercial controller and ez connect, should get about 6-8 gallons a minute of 170ish degree water. The heaters were cheap, $1085 with free ship on build.com. Install isn't cheap, but contractors, plumbers and electricians never are. The heaters can hit 185, and they work at altitude.... we are at 8750 above sea level so that was important. I have an easy little steam generator(made from triclamp parts, level switch, solenoid valve, water heater and PID, also has a pop off valve and pressure gauge for safety reasons) for raising and holding mash temperature.