This has been around for a few years. Johnstone sells them, can get extensions, and different spray tips, too.
I own one and love it. Few things I have learned is that there are multiple heads available.
Being mostly commercial I use larger stuff on the condenser coils, but this does work wonders on the evaporative coils. You can get extensions and can easily reach and clean the evap coils. I like to use it to get into those tight spots when splitting stacked condenser coils on certain models.
One thing this is great for is getting into sooted boiler chambers. Just last week had a Lochinvar that was in bad shape. Tore it down and the wand was able to reach deep into the chambers and just flush everything right out.