Webasto & Chinese diesel heater instant hot water shower 

The little knob thing on the valvestem on the spray head can usually be used to used to increase or decrease the flow for hotter or cooler water with the always-on clippy thing in place, used a similar setup in my first house which only had a bath and no shower, was cheap and effective... :D

Gees! I read all the comments too. Excellent ideas both in the comments and in your demo David, thanks mate.

Very impressive that they can heat the water that fast while flowing water without a heated reservoir.

That Chinese heater is amazing. Even has the water pump built in. Seems really powerful too. Shipping cost seems really high though. Someone needs to import a container of these and sell them locally. Thank you for testing this.

My Chinese water heater arrives today. Thanks to you I found it. So excited I am building a system for my caravan

I enjoy watching your videos goddammit, keep up the good work lol. If it weren't for people like you there wouldn't be people like me interested in taking on any of these projects. Good ideas thanks mate

Wow that quickly. I think it will work. I would plumb it like a house is plumbed. Let the machine heat the water tank in a plumped loop. Have a cold water inlet to keep the hotwater tank full. Have a water faucet with the hotwater hooked to it and a cold water hooked too; to control the water temperature for a comfortable shower. I found a 24kw 12 volt heater. That should keep up with the hotwater demand. Thank you for taking the time to set all of this up and giving this demonstration. You rock.

I appreciate the video and your hard work. 👍

Great videos, please keep them coming!

I was using a water-diesel heater 5KW cheapest what i can get, with a 2x EGR cooler to heat my house with radiators: 3 x 1500W and 1 x 800W. The heat lost from pipes is around 3000W, and I can tell that was working fine at 60C with no problem, but then I was trying to mix waste oil with diesel 50/50, and after, a month carbon build was so big that "atomizer that injection part" was blocked and when I was cleaning it I damaged that part.., so I will never use waste oil even if is thin with diesel... Thanks David for such amazing content !!

Good to see you didn’t give up on the water heater shower

I think I would heat the water in the tank then shower with that no chance of scalding yourself that way Keep up the great work

Keep up the good work mate, I am keen to try these out for use in my campervan, it's also great to hear a local accent. cheers

It might be useful to include a mixing valve in the set up to mix a little bit of cold water back in so it’s not scolding

I would pay for your successful tested recycling water shower. I have been searching for a propane heated recycled water shower system. If I understood all the moving parts better, I know it can be done . Wish you were my neighbour, bouncing ideas ..... love you lab experimental videos. 🇨🇦👏🏽🚌👏🏽🇨🇦

Just thinking about the flow/over pressure issue. Maybe flow switch and pipe temp sensor on the outlet, pressure switch on a tanked system as safety switch, rundown timer on burner with bypass valve to run cold water through it during cool down . I.E. shower flow stops, flow switch sends signal to open bypass valve and actuate rundown timer. Just ideas for safety systems. Good testing though.

Do a closed loop system with a heat exchanger let the loop heat up and then you can turn the shower on and off

That is quite close to a saleable product! An arduino away perhaps from an off grid HSE decontamination shower or caravan combi boiler. Your average domestic shower head delivers a lot less volume than your garden sprayer head. Excellent mock up.

Hot tubs have a flow control valve. That will shut off system with no flow. Also need to use a thermostatic mixing valve.it will prevent scalding. Check out the rixen hydronic system.

Probably already been said but a thermostatic mixer valve in combination with this would deliver at constant temp.

Put smaller diameter riser pipe to your shower head then it slightly lessens the flow rate through the whole system which allows the water to gather more heat on its way through and slowing the volume used.

I’m working on a similar project using a similar set up for an off grid washing machine but running into some hurdles with water pressure at the right time for the fill sequence of the washing machine.. let’s just say its a tough one but the challenge is the fun part

1st glad to see a good video before bed

That’s awesome!

Great stuff.. Cheers

Just need a bypass so that cold water from the tank can be drawn at the same time to be mixed with the hot at the shower riser pipe to control temperature but put a smaller bore hot riser pipe on it so that the flow is restricted enough to give the maximum comfortable heat when the cold water bypass is not adjusted to mix in.

Closed circuit water in and out and add a new pump to extract the water from the tank!

a mixing valve with temp control would be desirable.

You can fix the pressure by adjusting the black 'nut' at the rear of the trigger on the head.

Circuit the water to the main tank separately feed the head using a domestic shower pump ....certainly doable.

I will plump into the cold water line of the propane hot water tank with a flow control switch to turn on the diesel heater. That way the propane will give you a small amount of instant hot water but the diesel heater will give you longer hot water. If the water is hot going into the water tank than the propane burner won't turn on. I was thinking of doing that with a propane instant heater but diesel would be cheaper and easier

I want to see one piped into a central homing system. 5kw would be more than enough to maintain a constant temperature. Although to heat it up from cold you would need a bit more.

I liked the JP Chinese "Trauma" lol, but I think this is the best option.

Simple solution is put an inline 90 degree tap on the pipe, fast easy control, I regards to saving water till it’s warm, have a t on the hot water pipe to return water to the tank, once it’s getting warm shut off return to tank with a tap, and open up tap to showet head

BWAHAHA 😆 That was a right Ricky Fulton "dry boak " at 10:20

Congratulations Success 👍

for the fail safe what about a low pressure sensor in the output pipe and straight after a soleniod shut off valve, soon as the pressure drops the valve closed stops the flow, could have a relay in the system that drops out and kills the fuel and water pump, instant stop the system but stops burns,

@David McLuckie It is a shame this heater does not have a blower for hot air on it there are loads of these on aliexpress for around €300.

Run it through a thremostatic bar mixer shower body using a couple of washing machine taps

These heaters work better if you circulate the water through a water tank then when the water reaches the desired temperature you can then pump it to the shower

Wonder how the efficiency is compared to the horse showers /portable gas showers? Would be good to see a comparison. If the diesel heater could do hot air and water that would be a perfect combination for a camper

do these have a thermostat control option based on coolant/water temp?

Just a thought, you have a very cheap ECU in the Chinese heater the could be fitted to a wabasto at a push, and they cost bladders

Why not use on a hot water cylinder as a replacement for a chippy. Will the Chinese controller switch the water heater on and off between two set temperatures?

Can it heat the water without heating the air (pretty important in Van where I'm considering using this) or is there an option to send the heated air out the exhaust or something? Basically I'm wondering if I can use this for hot water in the summer time without heating up my van. It would only be as a back up option if I couldn't use my instant propane boiler for some reason. Also I've watched quite a few of your diesel heater videos now and I feel that I owe you a big thank you!! I've learned so much and I really appreciate all of the time and work you put into this. Great job and thanks!

That is awesome. Very cool. Now if you are in a caravan and have a set amount of water, say 100 liters, can you add filters and a pump to recycle and reuse that same water so you always have roughly that same 100 liters. Thanks for the cool videos. P.S.- Favorite commentary from the video- "That's a hot, hot shower. That's hot as fuck!"

Great channel mate, I'm very curious to see how efficient you could make a Chinese diesel air heater by putting an air to air heat exchanger (recuperator) on the exhaust and combustion air intake, see if you can get most of the waste heat out of the exhaust and back into the primary air. I guess it would be easier and more efficient to get the heat from the exhaust into the heater air intake (as opposed to the combustion air) but I'd be afraid if there was a leak in the recuperator that the exhaust gas would make it into the hot air delivery and suffocate someone. It seems like an obvious efficiency upgrage, basically turn it into a small condensing heater. I'd be very interested in an experiment like that. Thank's for all the great content.

Is the heat exchanger made out of steel or aluminum? What material is it? Will it rust through?

hello friend... do you think it can works by kerosene or LPG? thanks for useful video(like)

What if you wanted to heat the air in an RV, but you are not using the hot water?, will it cause an issue of overheating the unused water?

Would you try another test possibly? Use a pump and Recycle the the water within in a 20 or 30 gallon container. How long does it take to heat 20 gallons and what temp can you get the water up to? Pleeeaase

been considering one of these , what happens if you forget to turn on the water and start the unit up? does it have any protection?

where do you get the heater and control unit???

how you can both burn down your garage, and flood it.

Great videos, thank you. We’re diving in The Bering sea very cold water, I’ve been looking at getting a Toyo water heater for our hot water system. After watching many of your videos, I must ask your advice. Keeping seawater heating in mind and the toyo has a stainless heat exchanger. Can you recommend anyone else’s product in place of the 2400 dollar option? Thank you

Hi how long last chines one I am looking for my hiway truck

Nice heater for the floor heating…instead of the gas heater..

Thanks for the videos, appreciate them. I still haven't figured it out which sisten to install in my camper for both hot air and water. I've seen that new chinese heater for both but since you can't heat the water without heating the air, it's not a reasonable solution. (maybe redirecting the hot air towards outside i the summer). Was thinking of using two separate heaters, so one like this for water and one normal air heater and I'm wandering if I could use the same diesel intake pipe line from the fuel tank for both with a Y splitter... do you thig that will work?

Could it be used for a hot tub?

Hellooooo it’s mrs Doubtfire here.......

Thanks bud! I asked that, im planing for my next campervan build, the idea is to make a coolant circuit including floor heating, radiator with 12v fans as heater, heat interchanger for instant hot water (maybe store in inox tank) and maybe a wall radiator in the bathroom/shower. My concern is wich one use in order to manage a steady temperature without reaching max temp and shutting off, any recomendation?? Thanks again!

have you seen these jp combi diesel air and water things? they look promising as well, would love to see them tested

Thank you very much for your videos! You are the best! One question: if you had to choose between the Bobilvan heating system and the Chinese diesel water heater for you van, what water heating system would you choose? Btw, if you are willing to sell your Chinese diesel water heater feel free to contact me! I need one but it takes to much time to order it on Alibaba.

Another excellent vidjeeo. Now, here's a question for you. I've got a (inoperative) Eberspacher D5W which once it is working will be plumbed to a 5L calorifier. With this Eber D5W (5kw, very like your webasto) a water pump, 5L calorifier (and some sort of anti-explosion header/expansion tank), will the Eber be man enough to give me a decent shower from the calorifier? Or will I need a 12, 13, 15, 16KW chinese jobby? At the moment, the calorifier is heated by 240v when on a campsite, and that gives me plenty of water for a shower - the calorifier is set to about 65 degrees and has a thermostatic mixer outlet valve, so I am using (I reckon)10L cold + 5L hot for a 40ish degree shower, and that is a long shower, very generous. Ultimate goal is to be able to fire up a shower without needing to be on 240v hook up.

Love your video’s So..... my potential future set up I was thinking. Is using the Chinese diesel water/air heater, Have the water heater circulating the water in the tank hearing it up using a 12v pump. Then have a second 12v pump out from the tank with water to my shower. So the shower only needs to be turned on when the tank is hot? Thoughts on if this would work? And any chance of running it as a test?

Amusing videos, a problem with these heaters is soot build up. How cd this be dealt with? DO diesel engines offer potential solutions. How about some sort of electrical element burning off the soot, or injecting something clean and hot burning into the fuel line to remove the soot?

I would work with heat exchangers, that way you have much more flexibility and possibilitys.

Mixing valve to control hot water but what s going to happen when you not using hot water with that pump running and it just dead heading

Nice testing, for a small tank method another pump and filter that cleans the water as you pump it back in to that tank could be cool, what type of filter im not sure but I think it would be handy for a small loop shower system say. Good luck with the arduino work that could be a handy board, I've not dabbled coding arduinos yet, not had chance but they look handy once stabalised.

Also check out liquid to liquid heat exchanger.

take look at recycling shower or hour shower

Am thinking buying this for my semi. What is its power 5kw or 16kw? Is it fully automated? Could I program it to start say two hours before I come to work so my engine is warm and ready to go?

Would freelander water heater work just the basic on off switch and water pump , asking for wife lol love your video pal

Random question. Are you from Berwick or thereabouts? The accent is very musical.

Anyone in US bought it, how does it work?

Could you just shunt the 'lost' cold water run off back into the supply tank and recirculate until the water takes on a bit more heat ?Was going to add as someone below see' 'The hour shower' recirculating system just an in line water filter and add epsom salts to the water and use bio friendly soaps and shampoos - brilliant if that can be pulled off.

If you want to no wasted any water just recirculating the water thru the pump and then buy a cheap 5-0r 7 Stage water filter and you have an eternal heated water supply just add more when needed since there's are been some water evaporation ! And of course you're need a small shower tub for The recirculation !

WHAT HAPPENED to the circuit board you were going to work on , ?? AND on the last video did you see my comment about the other video that showed how to fix them ?? thanks .

Can any of these water heaters be ran on a timer or remotely for warming engine coolant?

Where can I find this heater

Hi mate, is there a way to install a simple switch to the cinese heater bypassing the controller?

You mention webasto from the scrappy, what will they call them? If I was looking on eBay/Ali what would you search for?

do you reckon you could use this to heat a small swimming pool circulating the water ?

Hi there David What's your thoughts on using gray corrugated washing machine pipe for the air inlet on a 5kw diesel heater?

Success, one working shower

Nice video, compliments! Would it be possible to heat up the 80 liter boiler in my boat?

RU-vid the hour shower. You could incorporate your heater with that system.

Do these act as a space heater as well as a water heater? for example in a motorhome it will produce heating and hot water?

DO YOU HAVE TO BE careful not to leave the spray nozzle closed too long ?? will it build up too much heat and pressure ??

Do you think this would be suitable for heating my Pure water in my window cleaning tank(500 litres) on a loop system back into the tank

Jesus wept - that shower might even be hot enough to satisfy Jessie!

arent these designed to heat diesel engine blocks in winter?

Priorities eh. Bet it could give you a few hot cups of coffee.

It needs a mat to dhower upon - a weclome mat would be dandy, thanking youuuUu

How much electricity does it use to run?

Helloooo! Mrs. Doubtfire?

I've still got that petrol eberspacher if you want it. If you didn't get my email, send me a pm and I'll get it to you.

See if BigClive.com on youtube can make you a board as a collaborative video project. He makes some really cool pcb's and probably has all the parts in stock to make it. Also what about the air water heater or do you think the heat output is just to low to make a on demand shower water heater.

If that can warm better than 25 deg c above ambient you have cracked the code of portable showers 🚿

How hot was it? H. A. F. !:- )