dzzz
™
Webasto air heaters do it the right way by increasing combustion air fan speed at altitude (stock feature in newest design)
Espar hydronic decreases fuel pump pulses with the optional kit mentioned. Before that option was created it was the two pump system controlled by a switch. Significant loss of BTU.
Webasto hydronic doesn't have an option, AFAIK. Someone mentioned partially blocking the exhaust (?) pipe at altitude. Increased back pressure?
The result may be the same, but the reason is very different. I was just talking about water flow being inadequate to remove the heat of normal full combustion.
The problem at altitude is too rich a mixture. All the units can be set up for high altitude, but then they are too lean near sea level.
Espar hydronic decreases fuel pump pulses with the optional kit mentioned. Before that option was created it was the two pump system controlled by a switch. Significant loss of BTU.
Webasto hydronic doesn't have an option, AFAIK. Someone mentioned partially blocking the exhaust (?) pipe at altitude. Increased back pressure?
It seems to me, that what you just described is more or less the behavior of a unit that is setup for high altitude. ....
The result may be the same, but the reason is very different. I was just talking about water flow being inadequate to remove the heat of normal full combustion.
The problem at altitude is too rich a mixture. All the units can be set up for high altitude, but then they are too lean near sea level.
Thanks, I was able to read the manual online. I was disappointed at the complicated wiring.............
If you would like a copy of the manual (10 pages), PM or email me.
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