As your site name indicates, Tankless water heaters are the Hogzilla of the RV water heater world. They cost a lot more, use a lot of LP gas, so much so that your existing lines may have to be enlarged, and, as mentioned, there are some service issues reported.
They are great for $200k motorhomes where amenities include a stand up 2 person shower and spa, backed up with a 120 gallon water tank or a water & drain hook-up at the local RV Resort, but in FGRV's, not so useful.
Most 6 gallon water heaters will deliver a tank of hot water within 15 minutes. If you turn it on as soon as you are parked you will have hot water before you are done with set up.
BTW: Those little tankless water heaters that mount on the wall and cost about $125.... There are illegal and unsafe for inside RV use.
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