DieselQuick to temperatureExact temperatureRental and events

Diesel heater: enjoy warm water in no time

Enjoy a wonderfully warm bath quickly and effortlessly!

On this page, discover everything about heating your spa with a diesel heater. We share useful information, explain how diesel heating works and how quickly the water reaches temperature.

Hot Tub Biodiesel Heater by Qrest

Who is a diesel heater for?

A diesel heater is the ideal choice when you want to heat your hot tub quickly and effortlessly. Perfect for holiday homes where the hot tub needs to reach temperature regularly and fast, but of course also for private use. This way, you can enjoy a wonderfully warm bath whenever you like, without having to wait long.

Diesel heating suits you if…

  • You use your hot tub regularly or multiple times in quick succession
  • You don't want to light and maintain the fire yourself
  • You rent out your hot tub and value simple operation
  • You want to bring the water up to temperature as quickly as possible
  • You want to set the water temperature precisely
  • You have a standard 230V power connection available
  • You choose a safe way of heating
  • You don't mind that the hot tub has an external heating system

What to watch out for

  • While heating, the diesel heater makes some noise
  • The heater produces exhaust fumes
  • A diesel heater requires a 230V power connection
  • You'll need fuel and a safe place to store it

Not sure if diesel suits your situation? Give us a call. We'll ask about your intended use and honestly advise you if another type would be a better fit.

In use Wood-fired ElectricConvenience and precision HybridBoth in one tub DieselThis page
Warm-up time2 to 3.5 hours to heatHeat pump 3 to 5 hours, depending on power. 6 kW approx. 5 hours, 3 kW 10 to 14 hoursBoth heaters together: the fastest option1.5-2 hours
ControlLight and refill it yourselfSwitch on and off via the control panel/appControl panel/lighting and refillingSwitch on and off via the control panel/app
Needed in the gardenDry wood and storage spaceSocket for a heat pump, three-phase power only for a 6 kW heaterWood or diesel and electricityFuel in a jerry can or tank
Keeping warmAdding extra fuelMaintains its own temperature, a heat pump can also coolElectric heat maintenance, heats up on wood or dieselMaintains its own temperature
MaintenanceRemove ash, check the chimneyCheck the filterRemove ash, check the chimneyCheck the filter
SuitsThose who enjoy having a fire goingThose who want efficient heating or don't want to deal with fireThose who want both, so there's a choice for every situationHoliday home, private use, for those who want the tub warm quickly
Wood-fired Electric Hybrid You are viewing this page
DieselThis page
Warm-up time
1.5-2 hours
Control
Switch on and off via the control panel/app
Needed in the garden
Fuel in a jerry can or tank
Keeping warm
Maintains its own temperature
Maintenance
Check the filter
Suits
Holiday home, private use, for those who want the tub warm quickly
Wood-fired
Warm-up time
2 to 3.5 hours to heat
Control
Light and refill it yourself
Needed in the garden
Dry wood and storage space
Keeping warm
Adding extra fuel
Maintenance
Remove ash, check the chimney
Suits
Those who enjoy having a fire going
Wood-fired
ElectricConvenience and precision
Warm-up time
Heat pump 3 to 5 hours, depending on power. 6 kW approx. 5 hours, 3 kW 10 to 14 hours
Control
Switch on and off via the control panel/app
Needed in the garden
Socket for a heat pump, three-phase power only for a 6 kW heater
Keeping warm
Maintains its own temperature, a heat pump can also cool
Maintenance
Check the filter
Suits
Those who want efficient heating or don't want to deal with fire
Electric
HybridBoth in one tub
Warm-up time
Both heaters together: the fastest option
Control
Control panel/lighting and refilling
Needed in the garden
Wood or diesel and electricity
Keeping warm
Electric heat maintenance, heats up on wood or diesel
Maintenance
Remove ash, check the chimney
Suits
Those who want both, so there's a choice for every situation
Hybrid

How the heating works

A diesel heater works with a burner that heats the water via a heat exchanger. You fill the tank, start the burner, and then maintain the temperature.

  1. beforehand

    Fill and check the tank

    Fill the fuel tank and check the hoses and connection.

  2. heating up

    Switch on

    Switch on the diesel heater via the digital control panel or the app.

  3. at temperature

    Set the temperature

    Set the desired temperature. The heater switches off automatically once it's reached.

  4. after use

    Shutting down

    Switch off the diesel heater when you no longer want to keep the water at temperature.

More information about the diesel heater

Why choose diesel over wood?

The biggest advantage of a diesel heater is its convenience and fast, reliable heating. Especially for rental use or events, it's important that the hot tub reaches temperature quickly and is easy to operate. Unlike a wood-fired heater, you don't need to light a fire, keep a stock of wood, or continuously tend the flames. For private use too, diesel heating is an excellent choice if you value speed and comfort above all.

How much diesel do you need to heat your hot tub?

To heat a hot tub from 8°C to 38°C, only around 3 litres of diesel are needed on average. The built-in diesel tank has a capacity of 50 litres. This means that with one full tank, you can heat your hot tub up to the full temperature about 16 times.

Can you smell or hear the heater, and is it smoke-free?

A diesel heater does make some noise and produces exhaust fumes, but in practice you'll barely notice this. Only during start-up might you briefly notice some smoke and a slight diesel smell. Once the heater is running, smoke and odour are hardly noticeable anymore. The noise level is also limited and is generally not experienced as bothersome.

Can I connect a diesel heater to my hot tub?

In many cases, this is definitely possible. Our diesel heater heats the water via special connections that we can install on almost any hot tub. When submitting your request, please send along a few photos of your hot tub. We're happy to review the possibilities and advise you on the best solution.

Frequently asked questions about diesel-heated hot tubs

Do I need electricity?

Yes, a diesel-heated hot tub requires a 230V power connection.

How quickly does the water heat up?

Within about 1.5-2 hours you'll be enjoying beautifully warm water.

How much fuel does the heater use?

To fully heat your hot tub, you'll need about 3 litres of diesel.

Is it suitable for rental use?

Absolutely! A diesel heater is simple and quick to operate. This heating method is ideal for holiday homes and rental accommodations, where convenience and user-friendliness are especially important.

Can I see this type in the showroom?

In our showroom, you can not only view the diesel heater, but also switch it on and off yourself. Outside stands a fully equipped hot tub with nearly all available options, including a connected diesel heater and heat pump. This way, you can test and compare both heating methods yourself!

Still have doubts or questions?

Not sure yet which heating method suits your needs best? Send us an email, give us a call, or visit our showroom for personal advice. We're available by phone from Monday to Friday, 10:00 AM to 5:00 PM, and on Saturdays from 10:00 AM to 4:00 PM.

Available immediately

Prefer not to wait for custom-made?

Our stock includes wellness products that are ready to go: same build quality, just without the wait. If there's a model that suits you, you can often have it at home within a few days.

  • Free delivery within the Netherlands
  • Come and take a look in Zutphen
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