[G Griffin]

You do know that hot water freezes more quickly than cold?
Even in summer.

[a900]

You do know that hot water freezes more quickly than cold?
Even in summer.

https://youtu.be/UjIdzcxSe3g

[a900]

The chrome tube is 60mm and the copper tube inside is 10mm .
Got a pic of one of these condensing boiler jobbies ?
Still very hot , dont know for sure but much more can be done yet .
Mk 2 chrome tube is only 55cm , same as Mk1 , if I was to mount the other way in the van I could up the chrome to 1m at least !
Be looking at 50 coils then 

I don’t have a pic but a video. You can also pick them up for like 99p eBay  auctions or This one £30.

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F202571403178

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F202571403178

I don’t have a pic but a video showing how they are made up. The burn chamber inside and fins to transfer the heat to a spiral water jacket.
https://youtu.be/p3Lis4bi11Q

Or this design in a oil fired boiler
https://youtu.be/6GQ_QLaSbMo

https://youtu.be/8mttYRGCHIw

[P @ F]

Very interesting but some of the condensers have ally doors which melts at about 600 !
The burner tube gets hotter, I know as I used one of my gutter vac tubes as a make shift exhaust when bench testing , let’s just say that I no longer need the silicone U bend !
I will see how it goes with Mk 2 , if not much gain the my trusty L5 is going to lose its heat exchanger , maybe I can place it after the coil in a separate chamber , if anything can grab the wasted heat that will !

[P @ F]

Mk2 finished , just about to test the beast !
Dropped down to 8mm copper coil and got more coils 😁

[a900]

Nice. Looks like a work of art. Get that longer end as the feed in and you should get the most temperature

[P @ F]

Nice. Looks like a work of art. Get that longer end as the feed in and you should get the most temperature

I have had to work it the other way , short pipe in up through the coil then out through the long straight to the reel , not ideal but the only option for best ease of build and servicing .
I got 32 coils in the end , I looked at getting 26 when using 10mm so could afford the gamble , looks like it paid off so far , as usual I forgot to take tank temp before test  , but I reckon 10c  at most as not worked today and it was feckin Baltic all day .
Result was 45c from the build before it got to reel , reckon on losing 10c by the time it gets to brush head with average hose out on floor , that gives me 35c from the get go on demand with no pre heat or re circ , it usually gets 45 mins or so straight re circ before I even touch glass on a normal day .
I am happy with what I have so far , 35 on demand which will rise with a pre heat and even more as the day goes on , my work is done for the moment me thinks       

[P @ F]

That’s more like it !

[a900]

Now that is impressive. The coil looks a work of art

Looks like your getting some decent temps from the little heater now

[Spruce]

Now that is impressive. The coil looks a work of art

Looks like your getting some decent temps from the little heater now

Just now his rear bumper is going to start to sag

[P @ F]

Now that is impressive. The coil looks a work of art

Looks like your getting some decent temps from the little heater now

Yes there is definitely an art to it , one wrong move and it’s £20 of tube down the drain , the worst bit is getting the salt back out when you’ve finished !

[P @ F]

Now that is impressive. The coil looks a work of art

Looks like your getting some decent temps from the little heater now

Just now his rear bumper is going to start to sag

I was thinking the same at the time , sadly that temp was at the end of the day , just been out getting the casing fitted up which is a chore as the draught  puts the heater into shutdown mode , but I got there in the end
I did test temps cos I remembered this time , true on demand temps for Mk 2 are 12 feed with 47 out , well happy with that from fire up !

[P @ F]

Mk2 looks a bit nicer than Mk1 😁

[a900]

Have you thought about putting a heat wrap around the effectively huge exhaust you have?

[P @ F]

Have you thought about putting a heat wrap around the effectively huge exhaust you have?

Had a quick look on eBay the other day , I think I will get some , could be something as simple as that will give me more temp as opposed to hacking up the L5 just yet !
I’m going to change the PRV to a 2 bar one while I’m at it as well , but less strain on the pump .

[a900]

I ordered this the other day for my set up. Was cheap and loads left

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F173678039595

Good idea with reducing the pressure valve

[P @ F]

I ordered this the other day for my set up. Was cheap and loads left

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F173678039595

Good idea with reducing the pressure valve

Sounds like you are doing a little add on , what could that be ?
If you have already fitted the tape has it made much difference , does it make the wrapped item cool to the touch ?

[a900]

Not been able to test with the tape on yet but my exhaust already came with like a sock version on before. Guess purely so it couldn’t start a fire.

Defo could touch it for a few seconds where as if I touch the metal of the exhaust I would leave skin behind.

Used the tape to wrap the egr cooler that iv plumbed into the exhaust. For now I’ve plumbed it into the heater loop so it preheats the water before the boiler. (Simple set up)  Been waiting for parts to recirculating back into the tank. Lower inlet water temps from the tank water should get more heat out the exhaust so that will be a more efficient. Altho I’ve also thought I will be trailing another pump and plumbing round the van that could freeze up this time of year when not using. So not sure about changing it yet

I work part time because of family commitments so tend to drain the pump and heat exchanger and let things freeze on days I’m not working

[P @ F]

Yes , I think I will wrap the exhaust and see where that takes me to temp wise , my connie is starting to look like a scrapyard 

[a900]

Are you still left with much heat out the exhaust.

The idea of house condensing boilers is that the water feeds in nearest the flu and progressively heats the water as it gets closer to the flame. Guess how you set it up. Water goes down the coils and then feeds back through the central return.