Anyone installed an Atwood LP/electric/heat exchange water heater?

[MrE]

My Raritan water heater is now leaking and I've looked at some of the less expensive alternatives and found the Atwood that also adds LP to the mix. Sounds like a great option for dry camping, but also would involve venting a compartment that I don't want to freeze when it's cold outside. I feel fairly certain that I could engineer a solution to vent just the water heater, just wondering if someone else has already done it. Thanks in advance.