Heating Help

electric to tankless propane conversion?

Doing some remote consulting on a DHW retrofit. Long story….

This setup is not providing desired efficiency and
performance. It serves 3 bathrooms, one kitchen, one laundry. But 2 of the bathrooms are used maybe a week per year.

Current situation is as pictured, two electric tanks, piped
in a way that I really don’t get. Apparently there used to be one tank serving
the two upstairs baths, and one serving rest of house. Now??

Recirc, obviously.

There is interest in converting to propane-fired tankless. Probably Rinnai, but open to suggestions. No significant dump loads (2.5 gpm showerheads, laundry, dishwasher; seldom if ever used all at once).

The current setup is in an attic space over an attached
garage.  Points of use are 20-50 ft away.

Can provide more info as necessary.

Thanks.

As you are looking to convert

I'd suggest that you see if there is a better location for the tankless. You are going to have to run a gas line anyway, so try to locate the tankless closer to the primary point of use. Don't continue the faults of the original low cost bidder. The best recirc system is no recirc system, but if you need one, look at www.gothotwater.com It is the best.

I represent Rinnai so agree with your choice;) The condensing RC80HPi model will give 4.3gpm at 70F rise and the RC98HPi will give 5.4 at 70F. Rinnai, correctly, does not allow PVC venting on our condensing water heaters. We have a Poly-prop inner liner in the 3/5" concentric vent system.

thanks

All under consideration. Thanks.