INSTALLING A WATER HEATING BOOSTER
Water heating booster tubes can be fitted to some woodfires installed in New Zealand in areas other
than the Christchurch and Canterbury clean air zones. Booster tubes are not available in Australia.
Fitting a water booster tube converts an /S model into a /W type. If a tube is retro-fitted, in some
cases the air metering plate must be changed to ensure that emission requirements are still met. Only
the models listed in the table below may be installed in the ‘clean air’ zones, and in some cases other
components will be required in addition to the water tube. (See the table below). The air metering
plate is fitted directly behind the sliding plate that controls the stove heat output, and it can be
reached by removing the air control knob (remove the screw underneath), and lifting off the air grille.
Water booster tube holes are provided and plugged in the back wall of the free-standing firebox and
the side walls of the in-built model. All plumbing work must meet the requirements of NZS 4603
unless local building regulations dictate otherwise. Pipe connections are 1” BSP and the pipe
positions are illustrated below. Special piping methods must be followed to ensure effective
circulation, and the hot water cylinder will need to have an internal riser pipe to two thirds of the
cylinder height to discourage unwanted water circulation when the woodfire is not burning. This
internal riser pipe must be connected to the return pipe from the woodfire.
THE SYSTEM MUST BE VENTED. See the warning on page 2.
For effective circulation, the pipes from the woodfire should rise at the rate of one in five toward the
storage cylinder, and ideally the cylinder should be within three metres of the woodfire. Detailed
piping instructions are included in the conversion kit, but two safety requirements deserve special
emphasis.
THERE MUST BE NO NON-RETURN OR SHUT-OFF VALVES IN THE PIPES BETWEEN
THE WOODFIRE AND THE STORAGE CYLINDER.
A WOODFIRE FITTED WITH A WATER HEATING BOOSTER MUST NOT BE FIRED
UNLESS IT IS CONNECTED TO A VENTED STORAGE CYLINDER FILLED WITH WATER
FREE TO CIRCULATE.
Inlet
Return
630 Toronto
590 Grandview
520 Verona
520 LE 3/5000
475 Siena
450 LE 2000 / Horizon
20
340
170
300
50
55
334
Return
Inlet
Front
Water Pipe Connection Positions
Free-standing Models
Viewed from Rear
In-built LE 3000 Models
#
#
#
CAUTION: This dimension has recent ly been increased. Always check all t he
pipe positions on your heat er before inst alling t he pipework.
9
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