More than enough heat for your tank unless it is being kept in a very cold place.
The 3 to 5 watt per gallon rule applies to small tanks, when you approach 100 gallons and up less watts per gallon are needed because the surface area to volume ratio is less.
I use a 300 watt heater on my 120 and it is more than I need.
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120 gallon sps/anemones/LPS reef since 2004
Apex controller
8 x 54 watt T5 PowerModule
Herbie's silent overflow system
Jebao DC 12000 return pump
Jecod CP-40 Cross-flow circulation device
Mini Bubble King 180
Barr Aquatics calcium reactor
Bucket fuge
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