On demand water heater

[maud gonne]

Thank you all for advice. Ecotemp looked promising, but whatever I get also has to mesh with my existing venting system (this is in Oregon) so I may have to get one that requires power hookup to ignite. There are battery back up options but costly, but can be added on at a later date if I choose. Sigh... Puna is so much easier in so many ways, but I can't seem to give up my Oregon getaway...