The Hcalory 8KW diesel heater (model HBH-3) is a diesel air heater for vans, caravans, boats and garages. It runs from 12V or 24V DC in a vehicle and from 240V AC with the supplied adapter. It heats 20-25 m² and costs £145.99.
An aluminium heat exchanger gives 18% higher combustion efficiency. Warmth arrives in 3 minutes and the outlet air reaches 100°C within 5 minutes. Fuel use is only 0.11 to 0.35 L/h from the 5 litre tank.
You can control it by Bluetooth app, LCD panel or remote. There are 10 heat settings, a timer and auto start-stop. The box includes the heater, LCD switch, remote, exhaust pipe, harness and AC adapter.
The Hcalory 8KW diesel heater has an upgraded aluminium heat exchanger. Hcalory says this gives 18% higher combustion efficiency. You should feel warmth after about 3 minutes. The outlet air reaches 100°C within 5 minutes. The product description also says it reaches 50°C in 3 minutes.
The listed heating area is 20 to 25 m². Is that realistic? Reviews suggest it depends on insulation. One buyer kept a garage at 18°C when it was 3°C outside. Another used it in an 8.5 m motorhome and said it coped perfectly. A third heated a well-insulated 6 m x 6 m workshop. They said it was only just enough and that a single garage would suit it better.
Fuel use runs from 0.11 to 0.35 L/h. It depends on which of the 10 heat settings you choose. The tank holds 5 litres. At the lowest setting that works out at roughly 45 hours. At full power it is about 14 hours.
Real-world figures are close to this. One reviewer ran it on setting 3 and got about 20 hours from 4 litres. Another reviewer said their tank lasted only about 2 days. Run time will change with the weather and how often the unit cycles.
The auto start-stop mode also helps. A temperature sensor watches the room. The fuel pump stays on standby and only runs when heat is needed.
Yes. It takes 12 V or 24 V DC from a vehicle. It also takes 220 to 240 V AC through the supplied AC power adapter. That makes it usable at home or on a campsite as well as in a van.
There is one caution on 24 V. One customer said the unit did not work on 24 V even after switching to the 24 V setting in the hidden menu. They fitted a voltage reducer to get it running. If you plan to use a 24 V system you should check this before installing it.
Another reviewer ran their unit indoors from a 300 W 12 V LED power supply plugged into the mains. Some people prefer that to the supplied adapter.
Yes. Thin air can cause incomplete combustion and smoke. To deal with this the heater has a 5-level altitude mode. The levels are 1,000 m, 2,000 m, 3,000 m, 4,000 m and 5,000 m. The control system adjusts the air-fuel mixture to suit.
The product description also mentions a smart dual-altitude mode at 2,500 m and 5,000 m. The two descriptions differ slightly. The listing claims full heating performance up to about 5,000 m. It also lists a plateau mode in the app. Check the manual for the exact altitude settings on your unit.
There are three ways to control it. You can use the LCD control panel, the wireless remote or the Bluetooth app. The remote works up to 30 m away. The app works up to 10 m.
The app covers a lot. You can set timers and pick from the 10 heat levels. You can switch on auto start-stop and plateau mode. There is also a fan mode that blows cold air in summer. You can change language and units too.
The LCD panel can sit inside the vehicle or room. A 1.5 m extension cable is included for this. One reviewer found the heater slow to start the pump. They said the app made everything easier. Another found some of the user interface confusing and said the instructions could be better.
The heater has a multi-layer safety system. It covers short circuit protection and reverse polarity protection. It also covers overvoltage protection and overheat protection at 270°C or above. The listing says the 2026 upgraded motherboard improves this.
What about fumes? The exhaust gases must be vented outdoors. They carry a risk of carbon monoxide poisoning. A reviewer who installed one in a house bought a carbon monoxide detector first. The manufacturer does not supply one.
Reviews also raise some concerns. Seven mentions of smoke were all negative. One person saw thick black smoke on the second run. Another reported a cracked heat exchanger that could leak exhaust fumes. Inspect the unit on arrival and check all seals before use.
This is a fair question. One three-star reviewer doubted it. They own two other 5 kW heaters and said the body size is the same. They also said the fuel pump ran at the same speed at full power. They suspected the output was nearer 5 kW. That is one customer's opinion rather than a tested measurement.
Other buyers were happier. A reviewer in a small bungalow heated the whole house from a unit in the porch. They got the living room to 19°C with the bedroom doors shut. A caravan owner said it kept the space warm over a winter. The overall rating is 4.3 out of 5 from 216 ratings. 69% of ratings are five stars and 7% are one star.
The box holds the heater and an LCD digital switch. It also has a remote control and an exhaust pipe. You get a wiring harness and an AC power adapter. The package weighs 9.5kg and measures 46.2 x 41.79 x 31.2 cm.
Several reviewers bought extras. A harder white fuel line was the most common. The supplied green line was described as easy to damage. One person used a higher-quality fuel line kit after their line perished within two months. That review may relate to another variant of the heater.
Other items mentioned were a spare remote battery and a carbon monoxide detector. You may also want an outdoor box or extra vent hoses. Some people fitted a bigger exhaust or an intake silencer to cut noise. The pump ticks while it runs. Reviewers said the heater itself becomes quiet after start-up.
The HCALORY HBH-3 is a diesel air heater with an adjustable output of up to 8 kW. It is sold in black and red and works in cars, vans, campers, RVs, trucks, boats, garages and homes. It runs from 12 V or 24 V DC in a vehicle. It also runs from 220 to 240 V AC with the included mains adapter. The listing says the 2026 upgraded motherboard adds safety protections. The HBH-3 is one of six models in the HCALORY range. The others are the HBS-3, HBS-3S, HBH-3S, HC1-U2 and HBU-3.
The heater has an improved aluminium heat exchanger. HCALORY says this gives 18% higher combustion efficiency. The glow plug preheats for one minute before ignition and keeps running for 30 seconds afterwards. This gives a stable start in temperatures as low as -20°C. The listing says you feel warmth after 3 minutes and that the outlet air reaches 100°C within 5 minutes. The product description says the heater reaches 50°C in 3 minutes. It does not say where that temperature is measured.
Fuel use is 0.11 to 0.35 L/h depending on the power setting. The fuel tank holds 5 L. HCALORY says the heater suits spaces of 20 to 25 m². One reviewer ran it in a 6 m by 6 m workshop and found it only just enough. They said it would suit a single garage better. They also questioned the 8 kW rating because the body and pump speed match their 5 kW heaters. Another reviewer heated an 8.5 m motorhome with no problems. A third kept a garage at 18°C when it was 3°C outside. A fourth kept two litres of fuel to 12 to 18 hours of use at a lower setting. A fifth reported about 20 hours of running on 4 L of fuel at setting 3.
There are three ways to control the heater: a Bluetooth app, an LCD control panel and a wireless remote. The remote works up to 30 m away. The app works up to 10 m away. The 1.5 m extension cable lets you fit the control unit inside the vehicle or room. The app sets timers and the 10 heat settings. It also sets auto start-stop and plateau mode and lets you change the temperature. It has language and unit switches too. The heater has a fan mode as well. One reviewer said it blows cold air on warm days. A temperature sensor checks the room temperature all the time. The fuel pump stays in standby and starts only when needed. The heater switches itself on and off to hold the set temperature. This cuts fuel use and limits big swings in temperature.
The bullet points describe five altitude settings: 1,000 m, 2,000 m, 3,000 m, 4,000 m and 5,000 m. The control system adjusts the air and fuel mix for thin air. This is meant to stop incomplete burning and smoke. The product description instead mentions a dual altitude mode of 2,500 m and 5,000 m. It also says the heater works up to 5,000 m (16,400 ft). The listing is not consistent on this point.
The heater has short circuit protection and reverse connection protection. It also has overvoltage protection and overheat protection at 270°C or above. Exhaust gases must be vented outdoors because of the risk of carbon monoxide poisoning. One reviewer fitted a carbon monoxide detector. Reviewers also raised these points:
The heater needs a 12 V supply to run from the mains. One reviewer used a 300 W 12 V power supply. The AC adapter is included in the box.
One reviewer spent over £500 on extras. These included a battery charger, a wall hole cutter, an outdoor box, extra vent hoses, jerry cans and a larger exhaust. They also made an intake silencer. They ran kerosene at as little as £1 per litre. They built up an energy bill credit of £650 over 2023. Another reviewer found the heater quiet after the first start-up. A reviewer who had trouble starting the pump found the app made it easier. Some reviewers said the instructions could be better.
Amazon lists other 8 kW diesel heaters at similar prices. These include a Sunster HTB1 at £142.99 and a maXpeedingrods model at £119.99. A YHDD 8KW model is listed at £212.99. The HBH-3 listing says all prices include VAT. It also gives a 30-day right of return for many products.
| Brand | HCALORY |
| Model | HBH-3 |
| Fuel type | Diesel |
| Heating power | Adjustable up to 8 kW |
| Heat settings | 10 |
| Fuel consumption | 0.11 to 0.35 L/h |
| Fuel tank capacity | 5 L |
| Heated space | 20 to 25 m² |
| Combustion efficiency gain | 18% |
| Heat exchanger | Aluminium |
| Glow plug | Preheats 1 minute before ignition and runs 30 seconds afterwards |
| Cold start | Down to -20°C |
| Time to warmth | 3 minutes |
| Outlet temperature | 100°C within 5 minutes |
| DC power | 12 V or 24 V |
| AC power | 220 to 240 V with adapter |
| Altitude mode | 5 levels from 1,000 m to 5,000 m |
| Control methods | Bluetooth app, LCD control panel, wireless remote |
| Remote control range | Up to 30 m |
| App control range | Up to 10 m |
| Control unit extension cable | 1.5 m |
| Auto start-stop | Yes |
| Thermostatic mode | Yes |
| Timer function | Yes |
| Fan mode | Yes |
| Pump type | Standard |
| Overheat protection | At 270°C or above |
| Other protections | Short circuit, reverse connection, overvoltage |
| Package dimensions | 46.2 x 41.79 x 31.2 cm |
| Weight | 9.5kg |
| In the box | Heater, LCD digital switch, remote control, exhaust pipe, harness, AC power adapter |
