I have a house in Guatemala, as such there is no such thing as buiding
codes or a professional plumber etc, only people who think they know
what they are doing and work for around 3 dollars a day so calling a
pro is OUT.
I have a bosch Aquastar model 38B Propane on demand hot water heater,
it is rated for 20kw.
The current install on the house i bought is the unit stuck on the
side of an outside wall, with no flue, about 10" from a concrete shelf
built over the unit, the propane supply is a 20lb tank connected with
naglane hose in poor condition host clamped to the regulator on one
end and copper tubing on the other.
Clearly this is not safe and the unit runs very rich possibly do to
altitude, let alone poor gas supply and no venting to suck the gasses
away from the unit.
I plan to chip a hole in the concrete above the unit install a 6' flue
per the manual, build a wall of sorts around it to shelter it from the
I am at 5000 ft, and am not sure if this unit has been preped for high
altitude but will deal with that problem later, the issue I have now
is setting up the propane lines.
The manual specs out a run of 10' for 3/8 and 60' for 1/2 copper
tubing, however I have about 100ft from where my heater is located to
where I want to place in propane bottles 2 x 100lb. Its not possible
to set the bottles closer. Would it be ok to use 3/8 tubing and carry
the propane at bottle pressure from the tanks to the house, mount the
regulator at the house and then run a short run of 1/2 tubing from the
regulator to the heater. I have also heard of problems with people
with a tank setup such as mine and a large load like this heater
having problems with freezing at the tank, would I be more or less
prone to freezing if I have the regulator located far from the tanks
allowing the entire length of line to be used as a heat sink.