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M300 Submersible Heater, 300W, up to 80 US Gal / 300 L

The Fluval M-Series submersible heater range provides exceptional performance, unsurpassed reliability and exclusive mirror technology to blend in with its surroundings.

M300 Submersible Heater, 300W, up to 80 US Gal / 300 L

Item #: A787 | UPC: 015561107877

The M-Series submersible heater range provides exceptional performance, unsurpassed reliability and exclusive mirror technology to blend in with its surroundings.

Models

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Features

300-Watt heater designed for aquariums up to 80 US Gal / 202 L
Made in Europe using superior components and construction
Durable, mirrored finish seamlessly blends heater into surroundings by reflecting colors of the aquarium
Computer-calibrated thermostat
Easy-to-adjust temperature control dial
Sleek and compact design
For use in freshwater and saltwater aquariums

Videos & Articles

Instruction Manual & Warranty

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Looking for Parts? View All M Heaters Series Parts

Questions & Answers

What are the minimum and maximum temperature settings on M Series heaters?

The minimum temperature is 66°F / 19°C. The maximum temperature is 86°F / 30°C.

Why is my M Series heater not reaching the desired temperature?

If the difference between the ambient room temperature and the heater’s set temperature is more than 18°F / 10°C, additional heating capacity is likely necessary. You can either add another heater or upgrade to a more powerful unit.

Are M Series heaters fully submersible?

Yes, M Series heaters are fully submersible.

Need Help? Get Answers. Visit the Support Center

Compare Models & Specs

The Fluval M-Series submersible heater range provides exceptional performance, unsurpassed reliability and exclusive mirror technology to blend in with its surroundings.

M50 Submersible Heater, 50W

up to 15 US Gal / 50 L

Item #

A781
UPC

015561107815
Aquarium Capacity

up to 15 US Gal / 50 L
Wattage (120 V / 60 Hz)

50W
Dimensions

11″ L x 1″ W x 1″ H / 28 x 2.5 x 2.5 cm

The Fluval M-Series submersible heater range provides exceptional performance, unsurpassed reliability and exclusive mirror technology to blend in with its surroundings.

M100 Submersible Heater, 100W

up to 30 US Gal / 100 L

Item #

A782
UPC

015561107822
Aquarium Capacity

up to 30 US Gal / 100 L
Wattage (120 V / 60 Hz)

100W
Dimensions

11″ L x 1″ W x 1″ H / 28 x 2.5 x 2.5 cm

The Fluval M-Series submersible heater range provides exceptional performance, unsurpassed reliability and exclusive mirror technology to blend in with its surroundings.

M150 Submersible Heater, 150W

up to 45 US Gal / 150 L

Item #

A783
UPC

015561107839
Aquarium Capacity

up to 45 US Gal / 150 L
Wattage (120 V / 60 Hz)

150W
Dimensions

13″ L x 1″ W x 1″ H / 33 x 2.5 x 2.5 cm

The Fluval M-Series submersible heater range provides exceptional performance, unsurpassed reliability and exclusive mirror technology to blend in with its surroundings.

M200 Submersible Heater, 200W

up to 65 US Gal / 200 L

Item #

A784
UPC

015561107846
Aquarium Capacity

up to 65 US Gal / 200 L
Wattage (120 V / 60 Hz)

200W
Dimensions

13″ L x 1″ W x 1″ H / 33 x 2.5 x 2.5 cm

The Fluval M-Series submersible heater range provides exceptional performance, unsurpassed reliability and exclusive mirror technology to blend in with its surroundings.

M300 Submersible Heater, 300W

up to 80 US Gal / 300 L

Item #

A787
UPC

015561107877
Aquarium Capacity

up to 80 US Gal / 300 L
Wattage (120 V / 60 Hz)

300W
Dimensions

15″ L x 1″ W x 1″ H / 38 x 2.5 x 2.5 cm