I have four tanks running and four visi therm stealths rating from 25 watts to 250. None of them that I have felt seem to get that hot. They do a good job and are accurate and durable. However I don't understand the purpose of the heater guard ? Is this to protect the heater from being broken ? Or the ray from getting burned ? If its to keep the heater from being broken a stealth should be fine. If its to keep the ray from being burned it would seem any heater of the same wattage would dissipate similar heat in which case I would be lead to believe you would still need a heater guard.