[windowswashed]

water to water plate heat exchanger. Any chance you can point me in the right direction?

[Spruce]

water to water plate heat exchanger. Any chance you can point me in the right direction?

There is a link on these threads.

http://www.ebay.co.uk/itm/WEBASTO-or-EBERSPACHER-Instant-Hot-Water-Heat-Exchanger-with-Mixer-Valve-/271200647299?pt=UK_CarsParts_Vehicles_CommercialVehicleParts_SM&hash=item3f24d17883#ht_1017wt_958

The plate heat exchanger is the bottom section.

To explain how these work have a look at this website.  

http://www.dudadiesel.com/heat_exchangers.php


Wort chillers are sold in the States for home brewing, but the principle is exactly the same. In their case they are taking very hot wort and chilling it using tap water and a heat exchanger.

In this instance the focus is on reducing the temperature of the wort and sending the now hot cooling water to waste. You want to pass hot water (Wort) from your engine cooling system and remove the heat from it before returning it to the engine. The removed heat is past into the water circuit from the WPF tank and returned as warm water.

http://www.youtube.com/watch?v=bTaB8MClPH4

The principle is the same as the heat exchanger used on the free heat website.
 
http://www.thefreeheater.co.uk/index.html

There is a video of his girlfriend showering. You would be doing exactly the same thing but the only difference is the warm shower water is being returned to the tank and not dumped on the road.

[robert mitchell]

i Think it would be possible to diy a diesel hot water system for around £1000

http://www.ebay.co.uk/itm/WEBASTO-THERMO-TOP-C-12V-5KW-DIESEL-MERCEDES-BMW-CAMPER-BOAT-WATER-HEATER-KIT-/121031990604?pt=UK_Sound_Vision_Other&hash=item1c2e119d4c

700 + postage for a new 5kw webasto with pump etc .

would need a heat exchanger , header tanks and pipework etc .

the kit has a timer but that could just be replaced with a switch  .

or you could use the timer to stop the van freezing in winter (as long as you have a good high capacity battery)

I would plumb it so that hot pure water can be recirculated to the tank when necessary.

Temperature would be controlled by a mixer valve .


You could do it even cheaper with secondhand parts.