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As an example, you wish to purchase a Slimfire 25 flame fire, live in the ‘Cool’ zone,
and have an area to heat of 65m
2
. The recommended ‘Heats up to’ capacity for this
model is 68m
2
, however you also have no wall insulation and a house built on stumps.
The heat loss total percentage is -15% (-7% + -8% = -15%) which is deducted from
the 68m
2
(the capacity of your heater) as a % to reduce it to 58m
2
. This will no longer
heat your desired 65m
2
. The next model up is the Royale Manual Inbuilt with a ‘Heats
up to’ capacity of 93m
2
, less the 15% heat loss = 79m
2
, which will adequately heat
the area.
step 1 climate
Pictured on the right is a climate map of
Australia that shows four winter climate
zones relevant to Rinnai Heaters;
Mild, Cool, Cold and Very Cold. It is
important that you choose the correct
zone that suits your application, as it
directly relates to the performance of
your heater. Detailed State maps can
be found on the ‘heater selector’ page
of our website: www.rinnai.com.au.
step 2 heating area
It is also important that you consider the
size of the heating area. This includes
adjacent rooms through permanently
open doorways and hallways. In this
brochure, on the back page, is the
approximate maximum area that the
unit will heat based on the climate
zones (ie. Step 1).
step 3 heat loss
Not all homes will have all of the
features listed in the table to the right.
Consequently, this will affect the heating
capacity. Place a alongside each of
the design features if they are relevant
to your home. Everywhere there is a
, an adjustment to the ‘Heats up to’
capacity will need to be made.
Please note that this is only a guide and
individual house designs and locations
may vary.
Contact the Rinnai Helpline
if you require further assistance
1300 366 388.
www.rinnai.com.au
calculate on-line
in 3 easy steps
Your area should be less than the Adjusted Capacity
Calculate your selected Rinnai Heater’s Capacity
1. Selected Heater
4. ‘Heats up
to’ Capacity
(see back page)
2. Area/Zone
5. Less
Heat Loss
(see table below)
3. Total area you
are going to heat
(length x width)
6. Adjusted
Capacity
m
2
m
2
m
2
%
Heat Loss Factors Deduct Example
No Ceiling Insulation -15% ______ %
No Wall Insulation -7% ______ % -7%
House built on stumps (not a slab) -8% ______ % -8%
No carpets on floors -5% ______ %
No drapes on windows -10% ______ %
Window area exceeding 15.0m
2
-15% ______ %
Ceiling area exceeding 2.4m
2
If Yes, height 2.5 - 2.8m -3% ______ %
2.8 - 3.0m
-6% ______ %
3.0m +
-9% ______ %
Reversible Ceiling Fan (positive) +5% ______ % ______
HEAT LOSS FACTOR TOTAL ______ % -15%