Pets
What Size Aquarium Heater Do You Need?
Calculate heater wattage by tank volume, room temperature, and target water temperature.
In this article
Rule
1W/litre for <5°C difference। Most of India: heater not needed! North India winter (Delhi, UP): heater needed Nov-Feb for tropical fish। 100L tank Delhi winter: 100-150W heater। South India: rarely needed।
Indian Climate
Summer: COOLING is bigger concern than heating! Fans across water surface reduce temperature 2-3°C।
⚡ CalcWolf Insight
The #1 fish killer after New Tank Syndrome is heater malfunction. Buy a heater with an external temperature controller ($15-30) as a safety backup — it cuts power to the heater if the water exceeds your set maximum, preventing catastrophic overheating.
Frequently asked questions
India में heater?▾
North winter: yes। South: rarely। Summer: cooling is the real problem।
Summer cooling?▾
Fan across surface: -2-3°C। Ice bottles in emergency।
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