Seapora SmartTemp Dual Digital Aquarium Heater, 300-watt
By Seapora
$67.93 (-21%) Chewy Price
$85.99 List Price
Tooltip Available
Promo, New Customers Only: Spend $49+, Get $20 eGift Card + Free Shipping with code: WELCOME
In Stock
FREE 1-3 day delivery
Free 365-day returns
Tooltip Available
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1 Customer Questions
Is the 200 watt good for a 40 gallon tank?
Answer by • Sep 16, 2025
A 200 watt heater would be suitable to heat up to 80 gallons of water. A 300 watt heater would work for 80-120 gallons. A good rule of thumb is for every watt, it will heat 2.5 gallons of water.

