Short answer: an LPG heater often makes sense when the caravan already carries gas and you want one shared fuel system. A diesel heater can suit diesel tow vehicles, cold-climate touring and travellers who prefer to reserve LPG for cooking and hot water. Both need compliant installation, combustion air, exhaust routing and dependable 12V power for controls and fans.
Comparison
| Factor | Diesel heater | LPG heater |
|---|---|---|
| Fuel logistics | Separate tank or approved connection; diesel widely available | Uses caravan cylinders already fitted to many vans |
| 12V demand | Glow-plug start can draw notable current; fan continues during shutdown | Ignition, control and fan still require 12V |
| Noise | Pump ticking and fan/exhaust noise vary by install | Fan noise; no diesel metering-pump tick |
| Altitude | Model-specific altitude capability or setting may be required | Model and regulator requirements still apply |
| Maintenance | Poor fuel, short cycling and carbon build-up need attention | Gas system inspection and appliance servicing |
| Best fit | Frequent cold use and diesel-based travel | Existing compliant LPG system and moderate heating needs |
Fuel use is only part of the energy budget
Both technologies use a combustion fuel to create heat and 12V electricity to run controls and blowers. Diesel heaters commonly draw their highest electrical current during start-up because of the glow element. Interrupting power during the programmed cool-down can damage the unit or create excess heat, so correct isolation and battery reserve matter.
Installation quality controls the experience
A poor installation can be noisy, smelly or unsafe regardless of fuel. The heater, exhaust, combustion-air intake, warm-air ducts, fuel or gas supply, wiring and clearances must match the manufacturer’s instructions. Exhaust gases must remain outside and away from openings. Fit and maintain alarms as required or recommended, and never use an unflued portable fuel-burning heater inside the caravan.
Altitude and cold-weather use
At altitude, thinner air changes combustion. Some diesel units automatically compensate; others require an approved altitude mode or kit. Check the exact operating range before an alpine trip. Also confirm cold-start behaviour, fuel grade, LPG regulator performance and battery capability at low temperature.
Noise and campsite manners
Listen to a real installation if possible. Pump mounting, duct size, exhaust silencing and fan speed affect perceived noise. Position outlets so warm air circulates without blowing directly onto bedding, and consider neighbours when locating exhaust and running the heater overnight.
Which should you choose?
- Diesel: regular winter touring, a desire for long runtime from a dedicated tank, or a diesel tow vehicle and compatible refill routine.
- Gas: an existing LPG system, limited space for another tank and established gas service support.
- Combination appliance: worth considering when one unit can also heat water and the layout benefits from consolidating equipment.
Before accepting a quote
- Ask for the exact model, Australian approval status and installation manual.
- Confirm rated output suits the insulated volume; oversized heaters can short-cycle.
- Record fuel use and 12V current at start, steady operation and shutdown.
- Check service agents and parts along your likely routes.
- Get the added installed weight and location for payload records.
An Australian touring scenario
A diesel 4WD owner spending months in alpine and high-country regions may value a dedicated diesel heater and readily available fuel. A caravan already carrying two LPG cylinders for cooking and hot water may avoid another tank by using an approved gas heater. If heating is only used on a few cool mornings each year, installation space, service support and simplicity may matter more than theoretical fuel endurance.
Limits of brochure comparisons
Rated heat output is not the same as fuel consumption or suitable caravan size. Insulation, air leakage, outside temperature and duct layout control comfort. An oversized heater may cycle at low load; an undersized unit may run continuously. Manufacturer altitude limits, fuel quality and electrical start-up requirements must be checked for the exact model rather than inferred from similar-looking units.
What to verify before buying or changing the system
- Australian approval and the exact installation/operating manual
- Minimum and maximum heat output for the caravan volume
- Fuel use at low and high settings
- 12V start-up, running and shutdown current
- Combustion-air and exhaust route with opening clearances
- Altitude operating range and approved compensation method
- Noise at bed locations and neighbouring campsites
- Service schedule, diagnostic support and replacement-part supply
Ongoing operation and maintenance
Run the heater long enough and at the settings recommended by its maker rather than repeatedly short-cycling it. Keep warm-air inlets and outlets unobstructed. Inspect exhaust and intake areas externally without touching hot parts, and stop use if fumes enter the caravan or operation changes. Maintain carbon-monoxide alarms to their instructions and replace them at the stated end of life.
A fair way to compare quotes
Give every supplier the same written brief: travelling party, normal destinations, longest unserviced stay, existing equipment, available installation space and remaining payload. Ask for the exact model numbers and manuals rather than accepting a category description. The quote should separate hardware, installation, commissioning, certification where applicable and removal or safe decommissioning of old equipment. It should also state exclusions, warranty responsibility and the added installed mass.
Compare the proposals against the same ordinary worst case. For electrical systems, that may be consecutive cloudy days and the largest simultaneous load. For water or waste systems, it may be the longest stay before lawful refill or disposal. For fuel-burning equipment, include cold starts, ventilation, fuel availability and servicing. A design that works only under ideal sun, perfect coverage or unlimited site facilities is not a touring plan.
Score each option for five things: safety and compliance, fit with your actual travel, payload, daily effort and recoverability after a fault. Purchase price belongs in the comparison, but so do new chargers, tanks, vents, cabling, plumbing, certification and future consumables. Give extra weight to factors that can strand you or close access to a campsite.
Plan for a fault, not just normal operation
Ask what happens when the chosen system fails on a Sunday in a regional town. Identify the safe isolation method, what other equipment is affected, whether the caravan remains usable and which parts are realistically stocked in Australia. A highly integrated appliance can save space but may remove several functions at once. Separate systems can provide redundancy but add weight, connections and maintenance. There is no universal winner; record the consequence that matters to your trip.
Carry only the spares and tools the manufacturer permits an owner to use. Do not bypass fuses, pressure devices, ventilation, battery management or combustion safety controls to keep travelling. If a fault involves gas, 230V electricity, overheating, fumes, damaged lithium batteries or leaking waste, isolate the equipment if safe, move people away from the hazard and obtain qualified assistance.
Recheck the decision when your travel changes
A setup chosen for powered coastal parks may not suit a remote inland season. Revisit capacity, fuel, payload and service access after adding appliances, changing tow vehicles, travelling with more people or planning longer stays. Reweigh after material modifications and keep the measured axle and total masses with the system records. This prevents several individually reasonable upgrades from quietly consuming the safety margin.
When keeping the current system is sensible
An upgrade is not automatically progress. If the present equipment is safe, supported and reliably covers your ordinary trips, maintenance or a small complementary item may solve the real problem with less weight and complexity. Replace equipment when measured performance, route requirements, safety, serviceability or a clearly defined new use justifies the change—not simply because a newer technology is popular.
Commissioning and trip records
Before departure, ask the installer to demonstrate normal operation, isolation, alarms, fault messages and safe shutdown. Keep the manual, model and serial number, invoice, commissioning information and a simple diagram with the caravan records. On the first trip, note energy or fuel use, temperatures, refill or disposal intervals and any nuisance alarms. Those observations turn the next adjustment into evidence-based maintenance rather than guesswork.
Your practical next step
Ask each installer to mark the proposed heater, intake, exhaust, fuel route and ducts on a caravan plan. Compare noise, service access, installed weight and fuel logistics alongside price. Reject any proposal that cannot provide the product manual and a compliant commissioning process.
Sources and further reading
- Truma Australia heating systems overview
- Truma Combi 4 gas heater specifications
- Truma Australia download centre for current manuals
Information checked 24 August 2026. Product specifications and campsite rules can change; confirm the current manual and local requirements before relying on them.
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