Portage & Main Outdoor Water Furnace Brick Lined BL Ultimizer Series—Wood Burning-- January 2013
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RECOMMENDATION
We recommend a hot water circulation loop that will dissipate at least 10% (ten percent) of the
estimated heat output of the water furnace in the event that circulation is reduced because of
electrical power failure. This loop shall be such that it can only be made inoperative by a deliberate
manual action. The minimum pipe to be used should be 18mm (.75 inch) in diameter.
PLACEMENT
We recommend a concrete or cement (noncombustible) slab for placing the P & M Outdoor Water
Furnace. The BL 2840 and BL3440 may be placed with patio bricks or piling or paving stones to
establish a level installation.
CHIMNEY
We recommend the use of insulated stainless steel pipe as a stack to minimize creosote formation. A
six (6) inch pipe is recommended for BL 2840 and an eight (8) inch pipe for BL 3440. The stack
should extend at least four (4) feet above the building where the Outdoor Water Furnace is located.
CLEARANCES
The Outdoor Water Furnace should be placed in a location where it can always get a significant
amount of fresh air. This is important for the water furnace to operate efficiently, and to have good
combustion.
The minimum installation clearances to combustible materials are:
Back & Sides: Twelve (18) inches(46 cm)
Front: Forty-eight (48) inches(122 cm)
Top Eighteen (18) inches(46 cm)
Flue Pipe: Eighteen (18) inches(46 cm)
Note:
Adequate space should also be left around the outdoor water furnace in addition to the
required clearances for servicing and maintenance.
PIPE TRENCH
Pre-insulated pipes such as LOGSTOR Dual Pex Flex, properly sized for circulation
requirements are recommended to convey the hot water from the outdoor water furnace to
each building. The piping should be laid in a flat trench eighteen (18) inches to thirty six (36)
inches deep. If high water table is encountered, the trench may be shallower, traffic
permitting. It is to your advantage to be down deeper at the boiler/furnace especially as it
makes the bend easier.
Use of water tight insulation is recommended as all Styrofoam will absorb water to the point it
becomes very poor insulation. Use only in high dry well drained areas if using at all.
All plumbing must be done according to applicable local codes.
