ProProducts does not list prices and wattages for their product because they want to make sure that the RHP is correctly tailored to the buyer's individual needs, without people ordering the incorrect unit.
RHPs produce infrared radiation similar to the sun. In this way the radiation heats up any object that it encounters (walls of enclosure, substrate, snake etc) rather than heating up the air like most conventional heating devices. The heat is then slowly released into the enclosure from the objects that received the Infrared radiation initially. In this way the RHP can produce a hot spot while also increasing ambient temps.