We have a natural gas water heater in the pantry in the kitchen. We
need more space, and are thinking about moving the woater heater
outside the house. We would have to build on a small structure to house
it, but we have an old gas grill with a working line that we would use.
Does anyone have any lead for information resources about this? Does
anyone have any experience with this who would be willing to share some
The only water heater I know that is designed for outside is a tankless
Rinnai. With a tank if it gets below 70 at night it will up your bill,
freezing and pilot going out is another concern. for a smll space look
into tankless Bosch, Rinnai or Takagi, you will save alot on water
heating. I have a Bosch and will never go back to a tank, my savings are
Almost all tankless gas water heaters can be installed outside with an
exterior vent cap. As for models designed to be installed outside
without any additional accessories, there are also the Bosch 250SXO
and the Paloma PH-28ROFN.
Wayne, who's spent too much time researching this
I'll probably suggest the obvious but you should check with the people
enforcing local building code. Never seen a water heater outside but
seems a lot of work to re-route and insulate hot and cold lines.
Depending on where you are the tank may need also insulation to
minimize heat loss and straps .
This is a common practice in Mexico - to have the water heater on
outside. One advantage is that the lost heat doesn't heat up the
Another is the fact that it is a warm temperate climate, and it is
warmer outside than inside, hence less heat loss.....
I can't imagine any code that would prohibit it, but I've never seen
it done in the US. Usually it is in the garage , where the temp is
close to the "outside" temp, but the ventilation is good.
Can I assume you are in a mild climate where it will not freeze the pipes?
Check local code as to the structure required. It may be considered an
addition to the house and a permit may be required for that, as well as the
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