Keggle mash without direct heat
 

Is it possible to mash in a keggle with no direct fire?

Yes. There are several ways...

1) Using a recirculating mash technique (RIMS/HERMS)

2) By simple infusion of water of the correct temp.

...and a lot of insulation.

You would be surprised how little heat loss there is, especially with a lid. Hi ambient temps help too.

I have used the Keggle as a mash tun. I did use a Banjo Burner to heat the water to the specific temp I needed, so I guess I did direct heat to the keggle. It worked well though.

It holds heat a lot better when it's nearly full for big beers or 10 gallons batches but I wouldn't leave an uninsulated keg alone for a 60 minute mash.

Well, out in Phoenix you can almost mash at ambient temps. Just holder a lighter underneath the keg for a few minutes and you're there.