JP Combi Diesel Hot Water Heater

I looked at buying the Truma Combi Diesel Air and Hot Water Heater and at over £2400 I was put off with the price. It seems the diesel version was a lot more expensive than the gas version. I looked around online for alternatives and came across JP Heaters in China. There are many diesel heater manufacturers in China, many sell on EBay and produce simple small heaters for around £100, I didnt want this type and I don’t think JP sell on EBay.

A quick word: I received no discount for this article nor am I paid by JP in anyway, either financially or with parts. The same applies to all items mentioned in this website. Below is an unbiased article.

According to their website JP Heaters have been making diesel heaters for over 20 years. I was surprised to find that they made a diesel heater almost identical to the Truma Combi Heater. In fact many of the JP parts can be swapped with Truma Parts. However, I was more surprised to find the price was $990 US Dollars for the full kit minus the shipping. That made me wonder, could it be any good, would it be reliable would I have problems?

Time for some homework: I decided to look around online to see what others have said but I could find very little, the diesel heater hadnt been around for long enough in the U.K. The Australians rate it highly but I couldnt find a single person in the UK that had bought one.

The Big Gamble….. I decided to take the plunge and buy one. Have I made the right decision?

Warranty: I sent an email to “Selina” at JP Heaters and asked about warranty, reliability, shipping etc. Selina assured me that the product comes with a 12 month warranty. But there are no distributors in the UK and if it did have to be sent back then that would be expensive. Maybe most parts are changeable with the Truma maybe I can get the spares to fit if I need them. Selina assured me they would try and diagnose any issues “if” I had a problem and send a replacement part or replace the unit if its within the 12 month warranty.

The Buying Process: As soon as I confirmed by email that I wanted to buy, JP sent me an invoice. Payment was sent by bank wire transfer, it took three days to be confirmed as having arrived in JP’s bank account.

Amazing Speed: Now this is were it gets fast, super fast. I ordered and paid on the Tuesday, payment was confirmed on the Friday and then I received a Whatsapp message from Selina to say, the parcel was now with FedEx. Now that is fast. I didnt give Selina my Whatsapp number just my mobile, she must have looked me up and sent me a message with FedEx tracking.

Paid Tuesday, Shipped Friday Delivered Monday: I was completely surprise when a FedEx van pulled up the following Monday with my heater, I have had parcels from the UK take twice as long. The speed of service was superb.

Its arrived: One large Box containing two smaller boxes. Everything was included, its a full kit, even the ducting pipes are part of the kit (I had already gone and bought a set). Only small issue was a small dent on the top of the heater, but thats nothing, I am not bothered about that.

Has it been a success? The big question, the quick answer is YES. I must be fair and say that I haven’t had it a long time and I have tested it only a few times. So far everything has worked fine. The first time I installed it, it took three attempts to start. This was because it took some time for the fuel to be pumped from the tank at the front to the heater at the back of the vehicle. I could see the fuel line was empty so I knew what was happening. As soon as I could see fuel enter the fuel filter I knew it was getting close to starting. Within moments of fuel entering the Heater, the system fired up.

Its quiet: Some diesel heaters can be noisy, I have to say this one isnt totally silent but it is fairly quiet I cannot see anybody complaining if they were parked up next to my van and I had the heater switched on. Its far too quiet.

Does it work and is it Hot? Yes again, the heating system is superb as I expected and the water is hot, nice and hot as you would expect in a shower.

Below: The first task for me was to fit the Exhaust and Air intake Pipe (combined) this system is very similar to the Webasto Cooker exhaust and air intake. The exhaust is a stainless steel pipe inside an outer pipe air flows both ways. The opening on the left is the water intake and not part of the JP Heater.

Below: I need to get a water supply to the Heater, I have installed a Shurflow Pump and Accumalator.

Below: I am using John Guest 12mm pipe with 12mm push fittings

Below: making a frame for the fuel pump. This type of pump can make a loud clicking sound when screwed down firm. I decided to build it in this frame to reduce noise then house it inside a sound insulated box. It’s actually quiet before the sound box has been made, the frame seems to be working well, just a gentle quiet clicking can be heard. Once inside a sound box and under the bed it will not be heard.

The yellow leaver below is so that the system can be drained in winter. I added a “run off valve” on the Hot Water output.

Below: I have given the heater its own small fuse box with breaker. I also added a 25 amp rated on/off switch with blue led inside the vehicle so that I could cut power if I ever needed to.

Below: The JP Heater also runs off 240 volts mains electricity supply if required.

Starting The JP Heater for the first time (what to expect)

Dont worry if there is smoke. Often this is normal for a first time installation. Below is a video from a JP Heater that a friend of mine installed. He made this video of it starting for the first time. He was concerned at first about the smoke but after 20 minutes of use it cleared (see other video below).

The JP Heater in use (note how quiet it is and almost no smoke at all). Some of the background noise is actually a passing tractor, note the video at the end its very quiet.

Screen First Time setup.

Its quick easy to setup the heater via the screen for the first time. In fact theres very little you need to do. The screen has a default setting, the fuel source is set to GAS. Even if your JP Heater is Diesel powered you still keep this setting on GAS ( do not use Mix1 or Mix2). Firstly check your heater is set to Gas (Fuel Source) then select the Vehicle icon (temperature) and turn this so its higher than the current temperature inside your van. Note how quiet the heater is inside the van as shown in the video, also note that its very difficult to hear the pump clicking (because its not screwed down on to a hard surface). I have placed the temperature sensor about mid height in the van away from any heater outlets, this seems to work fine. The ECO Fan setting (shown in the video below) is the heat output via the fan, theres also Low, High and Boost (basically the fan increases to blow more hot air).

Did you know? When you select the “Heater Mode” you also get hot water. When you select the Hot Water Mode you get hot water of course but no heater. This is so that in summer you can have plenty of Hot Water without having to turn the heater on.

Power Consumed at Startup

Below shows that around 6 to 12 amps are used at the startup phase, a lot is probably consumed by the glow plug. This then decreases significantly after the startup phase or after about 3 or 4 minutes. (see video below)

After Startup (low power consumption)

Below the video shows the power consumed after the startup phase. This is relatively low, in fact the video was filmed in spring and the weather was quite sunny . As you can see the solar energy was being used to run the heater. (The background noise is traffic not the heater)

How easy is it to get spare parts?

It seems very easy, I was told that spare parts are readily available from JP. I decided to test this. Probably the most common items to fail are the Glow Plug (too much soot) and maybe the Diesel Pump (although pumps can also last a very long time). I ordered a couple of spare Glow Plugs and Pumps (one set for a friend of mine) and it took just over a week to arrive here from China using FedEx. (Parts shipped Wednesday 10th March 2021 – Arrived Monday 15th March)

Spare Parts Costs: Pump $27.50, Glow Plug with Lead and Plus $29.50, Shipping by Fed Ex $55.00 (prices quoted March 2021).

Note: The Diesel Pump above is very quiet. My pump is fitted inside the vehicle and is under the bed, the clicking sound is so faint that it can hardly be heard. If you have a Diesel Heater with a noisy pump then I would recommend upgrading it to the JP Pump its worth the $27.50.

JP 6KW Diesel Combi Air & Water Heater

Contact: (usually replies within 24 hours)

Tel: +86 15210634118 (available on WhatsApp)

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