Hi James, great video. I purchased a heater that was advertised as 8kw, but when it arrived it did not have any markings / labels on it to indicate it was actually 8kw and it was fitted with the 22ml pump. I suspect it was a 5kw falsely advertised at 8kw! When I ran the heater on max setting, the max internal heat exchanger temperature reading indicated on the control box was 207 Celsius. After watching your video I swapped the pump to a 28ml and now get an internal heat exchanger temperature of 227 Celsius, hence more heat output! Still not sure if it is now running like an 8kw should, but at least its an improvement😁
@bigoldgrizzly
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Hi Jim, I very much look forward to seeing if the test run does increase the output to your required levels. I would so love this to work out but there appear to me to be a couple of possible pitfalls. Firstly, the figures you quote measure the fuel throughput at the heater and presumes 100% burn of all the diesel. A truer measure would I think be to measure total heat output ie. the sum of heat in the heated air blower, heat lost via the exhaust air [and, I suppose heat radiated by the unit itself] in the period it takes to burn 1 gallon. This is a truer measure of how much of the diesel being pumped in is actually fully burned, rather than passed out as the products of incomplete combustion, ie unburnt diesel and carbon monoxide. The second concern is regarding air supply. In order to burn an additional 25% of fuel there needs to be at 25% more oxygen [ie air volume] blown through the burn chamber, and since the fans for driving the combustion air and for the heater duct air, are fixed on the same motor shaft, the fan must also cope with 25% more 'heater air' at the same time. More air flow through the system in a given time, means that air must be made to flow faster through the unit. Since resistance to air flow usually rises as the square of velocity, the motor would have to work a great deal harder than +25% , just guessing here, but probably in excess of +50%. It will be interesting if the motor can meet the demand for this extra power and rotate the fan fast enough. From what I have seen on other videos both the 8kw and 5 kw units have exactly the same fan unit. Thinking about it, for the heater output to rise by 25%, the finned casing of the burn chamber must also be capable of transferring the extra heat in the same time period. Again as I understand it, the castings appear to be the same in both 5 and 8 kw heaters. I don't know what gear you have to hand but I am conscious of the fact that we can't expect you to have all the equipment to do rigorous lab testing but perhaps the following might serve to point one way or the other,, if you are able. - Carbon monoxide readings of the exhaust, and views of the exhaust gas - Air and exhaust input and output temperatures -The current consumed by the unit, [which will be about equal to what the fan is using] I can't help getting the feeling it will likely end up over fuelled and smoky and if it runs long enough, trip out on the 'overheat' sensor, but I'd really love to be proved wrong. Thanks for all your work on these videos, much appreciated Be good, be safe and be lucky ... OG
@DavidMcLuckie
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@Old Grizzly Hey Old Grizzly, nice to see you here. As OG has said. We've done the maths and the tests. And it doesn't work, sadly. The myriad of pump sizes that are available is for the numerous styles of air heaters and water heaters that the German companies came up with. For example, the 4KW Webasto diesel water heater uses a 65ML pump. But I am very glad to see other people are out there testing the heat output claims. :)
@paulkaygmailcom
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a 22ml pump on either the 5 or 8kw original heater at the same Hz will give the same fuel feed and thus same BTU output. If you swap to a 28ml pump you'll have 27% more fuel at the same Hz. I have a feeling the output of these pumps is not quite linear depending on the frequency and viscosity of the fuel anyway.
@chrisharrell2449
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Working in US gallons is confusing as its not the same as imperial gallons UK. but a LTR is the same world wide and these heaters are metric in origin, That said, Great content. Keep up the good work
@cfcyayaya
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The Chinese diesel heater is a direct copy of the 4kw German heater. So you will find the output to be closer to 4kw.
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