Seems that tank less hwh is a real bug a boo. I asked Jayco about it and the vibration issue in the 2016 Grey Hawk. I got this response from them.
Quote:
Girard has made some improvements on there water heater to be able to get an consistent flow of hot water. I have also attached the latest information from Ford on the vibration issue. BCM 1877 – 2016 E-Series E450 Cut-A-Ways and Stripped Chassis Stretched – Vibration Felt And Heard From Floor 55 MPH To 62 MPH Under Load
Some 2016 E-Series E450 Cut-A-Ways and Stripped Chassis stretched vehicles equipped with a 6.8L engine and 6R140 transmission may exhibit a vibration and moan at 55 mph to 62 mph under load. Engineering is currently investigating this condition and is developing a service repair procedure to be available shortly.Do not attempt repair or replacement of components at this time. Monitor QVM and OASIS bulletins for updates.
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Some one else solved the problem by putting a regulator between the hose bib and the hose and setting it to 50 to 55 psi.
I don't see the advantage to a tank less heater on a rv truthfully.
I'm trying to decide between a Grey Hawk and a Forester for my next purchase. The tank less heater is on the Con side of the list for Jayco.