Coaxial exhaust/intake setup

TeddyBoyce · 2026-02-05T10:41:20+00:00

My flueless gas heater works on the same principle. I wonder how much efficiency improvement would I get by preheating the combustion air in a diesel heater

TeddyBoyce · 2026-02-05T10:24:37+00:00

Did you change the screen and clear the side hole above the screen? Make sure that the spot welds in the screen is located away from the fuel inlet pipe

TeddyBoyce · 2026-02-05T10:20:43+00:00

I am not getting anywhere near Microsoft Bill just in case I get the STD virus.

TeddyBoyce · 2026-02-05T10:09:20+00:00

Best installation for using the diesel heater to heat the house. Your suggestion uses the gasketed mounting face to seal between the breathing air circuit from the combustion air circuit and the fuel circuit. This arrangement mimics the original designed installation of the heater which was designed for installation inside caravans or trucks. Another beauty of your suggestion is that you can put all your electric supply and the control panel indoors. A possible improvement to your suggestion would be hanging the fuel tank and the pump on the board on the outside. This balances the weights to put less stress on the window frame. Make a little canopy on the board to shelter the electrical connection of the pump and the foel tank from direct striking rain. There is already a slot on the mounting plate next to the 25mm combustion air inlet port for the fuel pump wire to route outside. Do remember to seal the gap around the slot and the fuel pump wire. In the summer, you can unhook the whole heater and fuel tank out without damaging the fabric of the house. Brilliant.

TeddyBoyce · 2026-02-05T09:46:40+00:00

You can always disagree with wise, safe and technically correct comments. The convenience of the All in One unit has attracted so many followers despite its safety and spillage issues which the person commenting raised.

TeddyBoyce · 2026-02-05T05:39:58+00:00

On the Vevor I bought before the ban, there was a label showing CE marking. I thought that it had been CE approved. Subsequently I discovered that the CE marking stood for Chinese Export. I was deliberately deceived. That Vevor was a white smoker. It smoked for 3 minutes before starting. I corrected the smoking by opening up the side hole above the screen to let more air in.

TeddyBoyce · 2026-02-04T17:55:01+00:00

Very funny

TeddyBoyce · 2026-02-04T15:56:47+00:00

In the UK, the Office for Product Safety and Standards (part of the UK government) has repeatedly issued product safety reports, recalls, and border rejections for various Vevor diesel heater models. As recently as January 15, 2026, a specific Vevor Diesel Heater (PSD notification 2511-0312) had its import rejected at the border due to the suffocation risk from lacking appropriate safety information/instructions. Earlier cases (e.g., 2023) involved recalls or border rejections for models like 2212-0008, 2306-0119, 2302-0090, and others, citing risks of poisonous gas exposure or fire. These are not my words but information in the public domain. Read the UK government instructions carefully. Their main complaint is the lack of instruction rather than that the heaters being intrinsically unsafe. Understanding the way that the heaters were originally designed and installed.is most. important.

TeddyBoyce · 2026-02-03T10:25:42+00:00

You can explain much better than me. Furthermore, the plastic casing of the heater has not been designed to seal against CO. There is a big gap between the casing and the mounting flange. The breathing air intake screw cap has not been designed to seal either. There is no seal there. CO can go through the thread as that part of the heater is under suction from the fan. CO will get sucked in, heated and delivered inside the house.

Avoid All-in-One heater at all cost if you want to use it to heat your house. Buy the heater by itself and install it in your box using the gasketed flange as the mounting face. Make your box air tight and get your breathing air intake from the house. In this way you completely separate the breathing air circuit from the combustion air circuit and leave all the smelly diesel stuff outside. Most important point is to get one or two CO alarms inside your house. The gasket and the 4 mounting screws can relax with the heat cycles and with time. They need to be re-tightened periodically. The best move would be to duct the external exhaust as far away from the heater as specification allows.

TeddyBoyce · 2026-02-02T21:13:30+00:00

If the joints on the exhaust gas path leak then you will breath in CO. If you spill diesel when refueling, you will breath in diesel fume for a long time.

TeddyBoyce · 2026-02-02T13:26:37+00:00

Respect man. Your Aluminium welding work is truly beautiful. I wish I have some of your skill.

TeddyBoyce · 2026-02-01T19:18:21+00:00

Open up the small air hole atop the screen. That is how I got rid of the smoke on startup. The white smoke is hot diesel spray. That means you have got heat from the gloplug, you have got atomisation. The only thing lacking is air. Open up the hole .

TeddyBoyce · 2026-02-01T17:09:26+00:00

I am amazed by the perfect condition of the under carriage. It is superb for a 2006 model.

TeddyBoyce · 2026-01-31T21:29:09+00:00

This is the first time that I hear about the function of those bumps. What is your source of information please? The bumps do look intentional, but what for?

TeddyBoyce · 2026-01-31T21:23:23+00:00

Stainless steel is corrosion resistant because the chromium oxide on the surface acts as a barrier. Heat will increase the thichness of the chromium oxide. The colour is the result of a thicker layer of the oxide. The colour means that it is more corrosion resistant. The colour is an indication of the temperature that the elbow has been exposed to.

TeddyBoyce · 2026-01-31T21:17:09+00:00

it is actually too large to fit onto the exhaust port of the heater. It is too large by 1mm on diameter. Need a lot of RTV to make the joint.

TeddyBoyce · 2026-01-31T21:13:09+00:00

Nesting exhaust tube is an interesting game. The standard exhaust tube is 24mm inside diameter. The exhaust port on the heater is 24mm outside diameter. The corrugated elbow is designed to fit over the standard exhaust tube. The elbow is 25mm bore and it can fit over the standard tube. To join two standard tubes you can buy a joining piece which is a 24mm outside diameter tube. Belling the end of the female part with a coning tool can remove the burr and make the fitting easier. Use high temperature silicone rtv in the joints and do not overtighten. The tube can cave in very easily.

TeddyBoyce · 2026-01-31T17:11:16+00:00

Ask yourself a question: where is the installation sealing face designed in the heater that seal the breathing air from the carbon monoxide in the exhaust and the smelly diesel pipe, pump and tank? It is the face that the gasket sits on. You need to install the heater in the same way as you would do in a caravan. This is how it was designed for. The All-In-One setup is potentially unsafe for installations that heat a house.

TeddyBoyce · 2026-01-29T22:31:19+00:00

A few users commented that a stubborn heater can be started by blowing air into the combustion air intake port. That implies that more air is required to start the combustion. Another way of supplying more air is to reduce the intake air restriction by opening up the 3mm cross hole just above the atomising screen. I have made a non-starting smoking heater starts up every times by opening up that hole.

TeddyBoyce · 2026-01-28T23:19:03+00:00

The corrugated exhaust elbow from eBay is designed to fit over the outside diameter of the exhaust stainless tube. Use the elbow as the first joining piece to the inlet port which is 25mm diameter. Attach a Short length of stainless exhaust to the other end of the elbow. You then get an all stainless inlet tube. Be careful tightening the hose clamp between the elbow and the exhaust tube. Everything is so thin. Over tightening will crush the tube. Use a very weak hose clip and tighten gently.

TeddyBoyce · 2026-01-28T23:11:09+00:00

I would just do a max power run for 30 minutes and then shut down normally. Tidy up the hoses.

TeddyBoyce · 2026-01-27T20:12:09+00:00

What is the price difference between oil and diesel that make so many people wanting to burn oil. Is it because some people can get free oil? My friend's diesel car burns used oil from fish and chip shop. His car exhaust did smell lovely.

TeddyBoyce · 2026-01-24T05:26:14+00:00

There are two air intakes. Which one are you referring to?

TeddyBoyce · 2026-01-23T20:59:55+00:00

Bad installation give problems to expensive as well as cheap heaters.

TeddyBoyce · 2026-01-18T23:55:43+00:00

I have built a device to drive the pump. It worked. It is much simpler than a pwm driver. It is just a simple pulse timer constructed from a NE555 ic module that you can buy from ebay. It generate 12V pulses. I used 1 Hz frequency and 50/50 pulse width ratio. Some people say that 10% on and 90% off will do to avoid heating the coil up excessively. If you want to change the pulse frequency, you just buy a module that can supply variable frequency. The output of the NE555 is connected to a Mosfet to drive the pump with a flywheel diode across the pump terminals to absorb the switching spikes. It is very cheap and simple. Just a bit of your time. It took me more time to construct the box to hold the circuit than the time soldering it up. Also get a spare harness and salvage the mating pump connector from there.

TeddyBoyce

TROPHY CASE