SUMMARY OF THE INVENTION
A preferred embodiment of the invention is described
hereinafter.
Having reference to outdoor spas or hot tubs, typi
cally they may be portable and made out of wood. It is
common for them to be made out of wood. The heater
of the herein invention is built into a side wall of the
portable spa which, as stated, may be made of redwood.
The unit is gas ?red and is suf?ciently compact to be
built into, or mounted in, the side wall of the spa. The
unit includes the gas-?red heater, a ?re box or equiva
lent unit, a ?nned tube heating unit, a ?ue products
collector, chamber or box, and a blower unit.
The blower unit is mounted above the flue collector
box. It is a double rotor unit. Gases of combustion enter
one end of the blower unit along with fresh air. Fresh or
outside air is admitted to the other end of the blower so
as to mix with the gases of combustion. The unit is
provided with a face plate which is in the form of a
panel on the outside which is exposed to the outside of
the spa. It is necessary to limit the temperature to which
the said face plate reaches to meet safety requirements,
and this is achieved by way of the mixing of the gases of
combustion with outside air.
A complete electrical control system is provided for
the gas-?red heater, with temperature controls, limit
controls, air pressure controls, and means to purge the
system with outside air before the gas heater is ener
gized.
SUMMARY OF THE INVENTIONA preferred embodiment of the invention is describedhereinafter.Having reference to outdoor spas or hot tubs, typically they may be portable and made out of wood. It iscommon for them to be made out of wood. The heaterof the herein invention is built into a side wall of theportable spa which, as stated, may be made of redwood.The unit is gas ?red and is suf?ciently compact to bebuilt into, or mounted in, the side wall of the spa. Theunit includes the gas-?red heater, a ?re box or equivalent unit, a ?nned tube heating unit, a ?ue productscollector, chamber or box, and a blower unit.The blower unit is mounted above the flue collectorbox. It is a double rotor unit. Gases of combustion enterone end of the blower unit along with fresh air. Fresh oroutside air is admitted to the other end of the blower soas to mix with the gases of combustion. The unit isprovided with a face plate which is in the form of apanel on the outside which is exposed to the outside ofthe spa. It is necessary to limit the temperature to whichthe said face plate reaches to meet safety requirements,and this is achieved by way of the mixing of the gases ofcombustion with outside air.A complete electrical control system is provided forthe gas-?red heater, with temperature controls, limitcontrols, air pressure controls, and means to purge thesystem with outside air before the gas heater is energized.
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