The new heater is now installed and incorporated with the old heater system design on the Highroof bus. Easiest and fastest way to install this would be to just place it under one of the sofas inside the bus and pull the heater hose out. But I decided to complicate it a little more but in the end with a much better result I believe. My bus had the Eberspacher heater M-code from factory so my idea is to remove the old heater and replace it with a new modern diesel heater.
Doing it this way, I will get a modern reliable diesel non explosive/safer heater than the old which ran on petrol. I will automatically get digital display with timer, remote start, thermostat control and much more. I will not loose space or hear the noise from it (like if it was installed inside the bus) because the heater will now be outside under the middle floor (inside the protective splashpan) where the old factory heater was mounted. I will now get heat not only in the rear of the bus but also in front cab and windshield ect. I will also add some extra airflaps in the heaterchannel so I can adjust the heat to only front or back to the rear floor, bed and top bunk. I will then insulate all pipes with aluminum air bubble foil to protect the heat from the cold surrounding. More work doing it like this but I think it will be all worth it in the end.
I started by removing the old crusty Eberspacher BA6 heater that was mounted in the center under the floor, mounted a new 90mm center pipe under floor instead (like on a ordinary Baywindow without the BA6 heater option). The new parking heater was the installed on the side of the new center pipe. It was a really tight fit, the height of the heater is 140mm and the space under floor was 145mm. I had to cut a 3-40mm notch out in one of the floor supports to make it even possible. The heater exhaust was wrapped in “header wrap” for less heat radiation and was routed out back to a muffler and then out in front of the left rear wheel. You don’t want to route the exhaust fumes out on the sliding door side of course! The fuel pump was mounted in a rubber holder in 40 degree angle on the frame of the bus, filter was put on outside for easier change in future. The air intake for the combustion chamber was routed back (don’t place it against wind/driving direction) and a filter bolted in the end. The air inlet to the heater fan is hooked up to the stock inlet pipe (from a hole under the rear rock n roll sofa). This means it will circulate warmer and warmer air, and don’t have to warm it up from ice cold outside air all the time. It will make it produce more heat too. The heater outlet is connected to a air flap (where I can choose where I want the hot air, front cabin or rear. I also made a extra heat pipe for the rear bed and top bunk, so you can feel the heat directly in the bed when you turn it on in the morning. 🙂 You can see the heat outlet in top bunk on the last picture. Stock is only rear floor otherwise. The small 10 liters diesel tank will be mounted under or behind the front passenger seat, this way you can easily see when it’s time to refill. It consumes only between 0,19-0,5 liters per hour. So on one tank it can run on full blast for about 20-24 hours before it time to fill it up again. Insulated all pipes from back/rear of the engine to all the way to the front cabin. Still have some electric wiring left to do before it all done. Can’t wait to test this beauty out!!
