To answer the question, , , no, I have heard nothing about offering a "real" water heater.
However, I am about to embark on a solution for my rig. I am sure the tankless is too hot and cycles off and on because of flow rate. Our pumps can't put enough water thru the heater fast enough for it to operate correctly.
Since I use a inline filter at the faucet and then run water thru a softener before going into my fresh tank I do not feel I need that "extra" filter Jayco installed. My plan is to remove the element from the extra filter in order to speed up flow.
If that does not help, I will try a better pump to move more water. I'm sure the tankless works great when water flow is high enough so I will try to speed things up a little.
One other thing that is hurting the performance is summer heat. Out fresh tanks are getting hot just sitting and waiting to be used. I believe the tankless will work much better with COLD water at the input. It does not take much heat to get water ready for a shower when it is 90 degrees before you heat it!!
Now, I'm not trying to sell you on Jayco, I just wanted to give my input on tankless heaters.
2015 Jayco Precept 35UN
Towing JEEP TJ with Roadmaster plates and bar w/Blue Ox Patriot brake
an Aluma low bed trailer with HD Road King and/or Polaris RZR onboard