I'd venture a guess at equal based on the performance of the large Webastos. They just introduced the smaller units when I got mine. My contact at Webasto tried to get me a unit on employee purchase, but they weren't offering it at the time. He had run a gasoline version in a station wagon and was happy with performance.

I decided to go with IDD as they are local and a vendor. Turns out mine is the only one they sold.

Espar makes gas versions, too.

We did 1 bus contract with a natural gas fueled Webasto. Pretty exciting the first time we powered it up. They had the gas valve and ignitor circuits reversed.


-John