The blown air heaters usually require 12V DC current to
start the unit and for thermostat control. As a guide
only, air blown and LPG gas heaters producing 2kW of
heat would adequately heat a 20 foot caravan trailer or
you choose an air blown heater that operates on LPG gas
then you may need to consider if you require a larger
gas bottle source to provide enough gas for heating as
well as cooking.
Truma (UK) Limited
has a various range of heaters for caravans, travel
trailers, 5th wheelers and motorhomes that
run on electricity or LPG gas. The manufacturer states
the Trumatic S2200 is only approved for caravans and the
S3002 and S3002 P are approved for caravans and
Truma Trumatic is one of their models of blown
air heater that operate with liquid gas and suck
air from the outside, warm it and then the
heated air is passed outside by an exhaust fan.
The manufacturer claims it is best suited for
the small caravan, trailer or motorhome. The
manufacturer states the gas consumption for the
Trumatic E2400 model is 100g/ph on half setting
and 200 g/ph on full setting.
have a range of furnace heaters for RV’s, caravans,
travel trailers, motorhomes and boats. The Suburban NT
RV Furnaces are LPG gas fired with electronic ignition.
There must be a certain gas pressure for these units to
operate and 12V DC to control the thermostat. LPG gas
certification is also required and an annual inspection
by a qualified service technician is recommended.
These Suburban heating furnaces have a heating range
from 24,000 – 40,000 BTU depending on the model. See
article - What is
BTU?. The heaters can also be either standard AC
power or 12V depending on the model.
state their ducted SF Series are suitable for midsize to
large RV’s and the ductless DD Series are suitable for
The manufacturer recommends you inspect the furnace
during the heating season at least monthly for the
presence of soot in the vent. If there is soot in the
vent they recommend the furnace be immediately shut down
as continued operation in this condition could cause
serious property damage or loss of life.
provide arange of blown airheaters that
run on clean burning butane gas or propane gas. The
manufacturer claims they provide quite, maintenance free
operation being easy to control with an electronic
thermostat. Two models are available one with 2kW heat
output and the other with 2.8 kW heat output. Propex
also have a range of gas fuelled water heaters for
motorhomes, trailers and caravans.
Diesel Fueled Heaters
you like to bush camp you may not always have an
electrical power source available then diesel fueled
heaters may be an option for you. Diesel fueled heaters
such as the
diesel heater and Webasto Air Top air heaters or the diesel
heater are reported to be very efficient and economical.
The Webasto Air Top series are an air heating
system that runs on diesel fuel. The manufacturer
claims the air heaters have a short heating-up time and
are cheap to run. There are three models that cover the
heating range required from a campervan up to the larger
recreational vehicle. Webasto claim the air heaters can
maintain a constant temperature thanks to an electronic
thermostat. Webasto also state they have optional
accessories so the air heater can be operated by digital
timer, remote control or 'phone'.
Fuel consumption is very economical. For example, for
the Webasto Air Top 3500 ST the fuel consumption is 0.17
– 0.42 (partial – full) l/h. You will also require
12/24V power for electronic ignition.
The air blower motor unit is usually installed in a
cupboard with the duct outlet close to the floor. It
may be wise to also purchase the option of the muffler
for the air heater if it does not come standard as this
will help reduce noise. As the motor can get some heat
to it, it is best not to place items that may melt
The exhaust is usually vented to the driver’s side of
the RV so any fumes will not be near the annex or awning
area. The diesel air heaters come with a plastic
storage tank for the diesel fuel and this can be mounted
on the exterior of the RV.
of the models of air heaters have the option for a
second air blower. Some owners have one air blower into
the main body of the caravan, travel trailer or
motorhome and one say in the shower/toilet cubicle which
can also double for a drying room.
If you have a air blower vented into the
shower cubicle make sure it is covered when showering.
If water gets into the pipe it can damage the heater and
will not be covered under warranty.
Some owners have also had the control switch located
close to their bed so they can start the heater without
leaving the warmth of their bed but Webasto also have a
Remote Start Unit that can operate up to 35 metres or a
Digital Timer that has three individual start-up times
which you can program 24 hours in advance.
Webasto Unit in
DometicEberspacher Airtronic operates by drawing in
room air, heating it and then blowing it back into the
RV compartment. For those of you with a motorhome, the
fuel burning heater can operate independently obtaining
its fuel from the vehicle’s own tank. The Airtronic D2
delivers 2.2 kW of hot blown air whereas the Airtronic
D4 produces 4 kW of hot blown air.
The fuel consumption varies of course, from model to
model and whether the Airtonic is operating on high or
low function. For example, the manufacturer claims the
Airtronic D4 Camper Plus uses 0.11 l/ph on low, 0.25
l/ph on medium and 0.38 l/ph on high. The manufacturer
also claims it is maintenance free after installation
but installation must be done by an authorized installer
for any warranty or liability claims.
Optional extras such as LED display, 24 hour timer as
well as radio and telephone remote control are
Eberspacheralso have a Combitronic air and water
heater. The Combitronic heats the hot water as well as
provides air blown warmth and operates as a duel fuel
system on either diesel fuel from the vehicles own tank,
mains power or a combination of both.
also have a Combi D diesel heater, designed by J
Eberspacher, which heats the vehicle (motorhome or can
be modified for a caravan) and the water at the same
time under ‘winter operation’. Under ‘summer operation’
only the water is heated.
The dimensions of the Truma Combi D6 are
525 mm long x 450 mm wide x 300 mm high, weights 15.8 kg
(without water) and it holds up to 10 litres of water.
Time taken to heat the water only is about 20 minutes
but to provide warmth to the vehicle or caravan plus
heat the water boiler takes about 80 minutes.
Diesel fuel consumption is between
220-630 ml/hr in regular operation at medium heat output
(1,000 W) 110 ml/h. Rated thermal output:
2000/4000/6000 W. The current input at 12 V from 1.7A to
max 7 A for short periods for heater and boiler and the
power required to heat the boiler max. 1.8 A. Standby
current is approx. 0.001 A.
Truma state the asymmetrical shape of the
10 litre stainless steel hot water boiler improves water
mixing providing better showering without having to
adjust the temperature of the water.
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