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What Size Diesel Heater for Caravan?

Mar 3

Many visitors, especially those who travel during the winter season, place keeping warm in their caravan or motorhome near the top of their priorities. There are a lot of choices for the right size heater.

However, you must select what heater is appropriate for your caravan or motorhome based on its size. Keep in mind that undersized heater will struggle to warm the space and there are different fuel consumption differences between 2kW, 4kW and 5kW diesel heater.

What Is the Best Caravan Diesel Heater?

The ideal size diesel heater for your caravan or motorhome is determined only by the amount of space you need to heat. Diesel heaters come in two different sizes: 2kW and 4kW. A diesel heater with a rating of 2kW will suffice for a Class B or B+ motorhome. Anything larger (Class A or Class C) will require the installation of a 4kW heater.

When it's cold weather, make sure you have the appropriate size heater for your space. A decent diesel heater should be included in every caravan or motorhome since many people must camp and journey during the winter. Continue reading to learn more about which size diesel heater is ideal for you and your family on extended journeys.

How Does a Diesel Heater Work?

If you experience problems with heat output while on the road, learning how it works may help you save money and time. The components in all types of diesel heaters are listed below.

  • Heater unit
  • Fuel pump
  • Inlet/outlet

Your heater location may or may not come with additional accessories, depending on the brand and type you pick. The more costly versions will most likely include more attachments, but you must first determine which of those you need.

Heating Unit

The heating element is the major component of your diesel heater. The heating unit will be installed inside your caravan or motorhome using a mounting plate for convenient access. On one end of your device, there will be a fan that draws chilly air in and warms it up.

The device then passes the heated air into a combustion chamber, where it is heated and warmed. Fuel is sent through the combustion process by a fuel tank positioned beneath the appliance, where it is heated before being exhausted from the top. The air inside the convection heater is warmed before it is expelled from the bottom of the device and into your motorhome, where it will heat up everything.

When your motorhome's temperature is reached, your air conditioner will continue to intake air until the desired level of temperature has been achieved. A remote control is typically supplied with diesel heaters, allowing you to adjust the temperature.

Carbon monoxide is another issue that frequently comes up about diesel heaters. Diesel heaters produce virtually no carbon monoxide. The little carbon monoxide produced by these heaters is dispersed through the exhaust outlet and does not enter your motorhome. You don't have to be concerned about carbon monoxide accumulating inside your motorhome.

However, if you're looking for an additional layer of protection and avoid carbon build up, consider installing a carbon monoxide alarm in your motorhome.

Fuel Pump

The fuel tank is where the diesel fuel enters the machine. The fuel pump keeps the quantity of fuel entering the device consistent by regulating it without causing it to overheat or overload. You can alter the fuel dosage by adjusting the fuel pump on your unit. depends on your unit and the type of fuel required

When installing a diesel heater, make sure the fuel pump is positioned vertically. This will prevent any bubbles from forming in your pump and will allow for optimum performance.

To start, you'll need to prime the fuel line before your first use of a diesel pump. The fuel line will be lubricated with diesel fuel after priming it. You won't receive the lubrication you require if you don't prime the fuel line first.


The tubes that supply your diesel heater's air will be called inlet and outlet tubes. An air intake and exhaust tube are included. These tubes bring chilly air into the device and eliminate hot air from the device outside of your home. Furthermore, there is a vent outlet that removes carbon monoxide from the fumes outside of your motorhome, preventing it from accumulating inside.

Can You Get Different Size Diesel Heaters?

When buying a diesel heater, you should select one that is the best fit for your caravan or motorhome in terms of size. The ideal size diesel heater for your caravan or motorhome is determined solely by the amount of space you want to heat. If you get a diesel heater that is too small for your vehicle, it will not effectively heat the area and use up energy.

When searching for a diesel heater, you have two distinct sizes to choose from.

  • 2kW
  • 4kW

A 2kW heater will suffice if you have a Class B or B+ motorhome. A 4kW heater is required if you have a larger motorhome, such as a Class A or C. Using a 2kW to heat a Class A or C motorhome will result in increased fuel usage and power costs.

There are a few additional size choices for diesel heaters beyond 2kW or 4kW, but depending on the size of your motor home, these will be your two best options. If you have a tiny, mostly canvas motorhome, you'll need to invest in a 2.2 kW heater since the canvas generates more heat loss.

Does a Larger Size Make Enough of a Difference Compared to the Smaller Size?

Yes, they can. It's true that the size of your heater has an impact on how much space it can effectively and efficiently heat. A smaller-sized heater will take considerably longer to warm a motorhome with a class A or C engine.

If you use a heater that is too big, you won't be able to keep it on full. This will cause your heater to remain in an idle condition for lengthy periods of time, resulting in a lot of carbon buildup. A space heater that is too big for your motorhome will on and off, resulting in additional noise and disruption.

A tiny heater may require the heater to be on high for the majority of the time, while a big one will not. A small heater may cause your motorhome's air conditioner to run constantly, and this may create additional noise and strain during travel.

How Much Does a Diesel Heater Cost?

You can't simply choose between the two types of propane heaters, although they are compatible. You must weigh the advantages and disadvantages of each before deciding whether or not to install a diesel heater in your caravan or motorhome. The following are some of the expenses associated with installing a diesel heater:

Fuel Costs

While these expenses might appear to be high, purchasing the appropriate diesel heater for your caravan or motorhome will save you money in the long run.

Initial Purchase

One of the factors to consider when choosing which model to buy is the cost. Cheap brands or expensive models?

Determine the heating options you'll need to properly warm your space by measuring it. You'll then need to buy your heater once you've figured out how much heat you'll require. Depending on the brand and model you choose, a 2kW diesel heater may cost anywhere from $100 to $150. A 4kW heater, on the other hand, will set you back between $150 and $200.

Best Size Diesel Heater for Your Caravan Or Motorhome

Keeping warm in your recreational vehicle or motorhome is near the top of many people's concerns, especially those who journey during the winter season. There are many choices for diesel heaters when looking for the ideal one. However, you must choose a heater that is appropriate for your caravan or motorhome based on its size.

The optimum size diesel heater for your caravan or motorhome is determined only by the amount of space you need to heat. Diesel heaters are available in two different wattage ranges: 2kW and 4kW. A 2kW heater will suffice if you have a Class B or B+ motorhome. Anything greater (Class A or Class C) would require the installation of a 4kW heater.