The MTM foam cannons come with a 1.25mm orifice standard. I like that size for my Kranzle, but I have a dedicated 20A circuit. If you have any issues with the pressure washer turning off or tripping your breaker, you'll want to swap to this larger 1.5mm orifice. Your foam won't be quite as thick, but it still gets the job done well.
The idea here is to increase the size of the hole, creating less pressure, and allowing your Kranzle to operate under 15A.
MTM offers a 60 day warranty for any possible defects with their products. Info about their warranty can be found Here.