steeljag..you can have both on as mentioned by Tmmar. It does help with the heating of the water IF you are using a lot. For us, we are both morning showerers (is that a word??). So we pop the gas on to help keep the hot water flowing. We just turn it off again when we're done, or at the very least as part of our checklist when we break camp.
Ed and Sharon
2010 Wildcat 28RKBS
2011 Ford F-250 XLT, 6.7L PSD
Ride-Rite Airbags and Airlift wireless remote compressor...nice!
I thought I was wrong once, but I was wrong!