Rinna RUR98I won't circulate at set point

Rinna RUR98I won't circulate at set point

by Greg Tieperman
(Plano TX)

I have (2) Rinnai RUR98I units installed on 6/23/16. Neither will circulate water at temp set point. They run 15 to 20 degrees under set point .. 120 is 100 to 105 & 140 runs 120 to 125. I want to run 120. The internal recirculation function continues circulating but flame cycles on & off at reasonable intervals (so it seems) but I can't pull anywhere close to the temp I have set at the thermostats. Very odd since it's happening on both new units. I'm using a loop manifold connecting hot to cold at the end faucet. I'm running 4 to 5 hours & still won't get within 15 degrees of set point??? Any thoughts?

Click here to post comments

Join in and write your own page! It's easy to do. How? Simply click here to return to Tankless.

water heaters