Rank #2 in Best Diesel Heaters 2026: 10 Ranked, and Why the kW Claims Don't Add Up
PRIJESSE 12V 5 kW Diesel Air Heater with LCD and 10 L Tank
Price and rating as shown on Amazon when we collected them. Both change.
The PRIJESSE diesel air heater takes number 2 in this guide. It is a 12V parking heater at £71.99, rated 4.3 out of 5 from 272 Amazon ratings, and the listing leads with "Heater power: 5KW". On its own terms that figure holds together: the model number is listed as TSD-2(12V 5000W), and 5,000 watts is 5 kW, so the headline and the model code say the same thing.
What does not hold together is the casing. The specification gives an item size of about 15.3 x 5.7 x 5.7 inches — the same three dimensions the 8 kW heater elsewhere in this guide is sold under. One shell cannot be a 5 kW heater and an 8 kW heater at once, and neither listing explains where the extra heat is meant to come from. There is a smaller oddity in the same bullet: the fuel line reads "Fuel gasoline: diesel", so the label names one fuel and the value names another. Everything on this page comes from the Amazon listing and its customer reviews — we have not run, fitted or tested this heater ourselves.
How those 272 ratings break down
An average hides its own shape. This is the spread behind the 4.3 stars.
Specification
Exactly as published on the Amazon listing, field for field.
| Price | £71.99 |
|---|---|
| Customer rating | 4.3 out of 5 from 272 ratings |
| Claimed heater power | 5KW |
| Model number | TSD-2(12V 5000W) |
| Item size (as listed) | about 15.3 x 5.7 x 5.7 inches |
| Package dimensions | 40 x 16 x 16 cm; 10 kg |
| Rated voltage | 12V |
| Fuel field (as listed) | "Fuel gasoline: diesel" |
What buyers actually say
Quoted from customer reviews on Amazon
Verified purchase“great heater works really well in our motorhome , we had a very expansive version of this heater which kept breaking down, we decided to give this a chance so glad we did kept van nice and warm highly recommended”
Verified purchase“Installed this in my campervan. Warms up in about a minute and is amazing. Has up to 5 settings and uses a tiny amount of fuel. Would highly recommend. A+”
What it is up against
The rivals it was ranked against in Best Diesel Heaters 2026: 10 Ranked, and Why the kW Claims Don't Add Up.
Questions people ask
How big is the PRIJESSE diesel air heater?
The specification bullet gives an item size of about 15.3 x 5.7 x 5.7 inches, and the package dimensions are listed separately as 40 x 16 x 16 cm at 10 kg.
How much heat does it claim to produce?
The specification bullet says "Heater power: 5KW" and the model number is TSD-2(12V 5000W), so both the headline and the model code point to 5 kW.
What fuel does it run on?
The fuel line in the specification bullet reads "Fuel gasoline: diesel" — the label says gasoline, the value says diesel.
What voltage does it need?
The listing gives a rated voltage of 12V, and the model number repeats it as TSD-2(12V 5000W).
What temperature range is quoted?
Heater working temperature is given as -40°C to +50°C, and the oil pump working temperature as -40°C to +40°C.
What comes in the box?
1 x Air Heater, 1 x Silencer, 1 x LCD Thermostat, 1 x Remote Control, 1 x Tank (10L), 1 x Wire Bundle, 2 x Vent, 2 x Air Outlet Pipe, 1 x Intake Pipe, 1 x Exhaust Pipe, 1 x Oil Pump, 1 x Fixed Plate and 1 x White Oil Pipe.
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