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The 100w bulb is essentially a 100w heater located in a small confined space. You would want to close off the air intake louvers during this time to minimize heat loss. Extreme frigid conditions and wind would complicate this. You could use a 150w bulb and get 50% more heat, but you would need to be more careful to have proper clearance around the bulb to prevent melting something or starting a fire. In a power failure, you would still need a generator to power the bulb. A 1500w heater will heat a small-medium size room (generally to a comfortable temp well above freezing), the spa enlosed area is much less than even 1/10th of that - hence the 100w bulb. And all it needs to do is keep it somewhat above freezing.
: Ok, I have read this idea of a light bulb keeping the equipment warm a
: few times lately...even had the Catalina rep tell me I could have
: prevented a freezeup with just a light bulb...
: Would you please explain to me how one small light bulb could have saved
: my tub from freezing up in below zero weather? Am I missing something
: big time here???
PLEASE NOTE: We are Roberts Hot Tubs Inc. (manufacturers of traditional wooden hot tubs)! If you found this webpage through a search engine while searching for a different brand of spa, we are not them! We simply appeared in your search due to that name being talked about on this particular web page. The phone number below will reach Roberts Hot Tubs, not the manufacturer of the brand of spa you're searching for. This is a public forum and you're more than welcome to post a question asking for contact or other information for a particular brand of spa. Almost certainly someone will be able to assist you.