I'm assuming this will work with a heater that doesn't have it's own thermostat and requires a controller?

Yes. You can use it to control a heater with no built in thermostat. I use it as a primary controller with my heaters set 1 degree higher as a backup safety.

Should I get the 306a or the 308s? Please advise

The best of the two units is the 308. If the temperature drops below a certain point ( which YOU set on the unit) the heater will turn on and bring the temperature up to where you want it. Now if the temperature rises and needs to be brought down then (if YOU are using a chiller or you are using cooling fans they will come on) again YOU will set that temperature for when it goes over a certain degree. Like if you don't want the temperature to go over lets say 80*. The moment that the unit reaches 79.5* it should come on to cool what ever you want. It will stay on until it reaches the temperature that you set on the unit. Lets say you set it to 77* it will cool down to that temperature. You have to make the settings with the 308 it is not set for you, you have to make the settings

Is there a way of tracking on the app when heater is activated?

No. Only could check the temperature fluctuation via the INKBIRD app.

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Inkbird ITC-306A WiFi Aquarium Thermostat with Two Probes only for Heater

Product ID: 158517985

Details

Brand
Inkbird
Color
Blue and White
Material
Plastic
Product Dimensions
6.69"L x x
Voltage
120 volts

📱WiFi app alerts & remote control

🔥1200W max heater power

🌡️Dual probes with ±3°C differential alarm

€ 118.84

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Description

🌊 Keep your aquatic world perfectly balanced—smart, safe, and always connected!

DUAL SAFETY RELAYS - Double protection to prevent overheating and safeguard your aquatic ecosystem
SMART WI FI CONNECTIVITY - Real-time temperature alerts and remote control via your smartphone app
PLUG PLAY COMPATIBILITY - Works seamlessly with most 1100W heaters—no assembly required
CUSTOMIZABLE HEATING TIMER - Set heating duration from 1 to 72 hours with automatic timeout alerts
PRECISION DUAL PROBE MONITORING - Detects temperature differences over 3°C to ensure consistent tank conditions

The Inkbird ITC-306A is a WiFi-enabled aquarium thermostat featuring dual probes and dual relays for enhanced safety and precision. It supports heaters up to 1200W, offers customizable heating timers, and sends instant alerts to your phone if temperature anomalies occur, ensuring optimal conditions for fish and reptiles with effortless plug-and-play setup.

Specifications

ASIN	B07X1JT372
Best Sellers Rank	#18,547 in Pet Supplies ( See Top 100 in Pet Supplies ) #788 in Aquarium Accessories
Brand Name	Inkbird
Color	Blue and White and Black
Customer Reviews	4.4 4.4 out of 5 stars (947)
Display Type	LCD
Included Components	temperature controller
Item Dimensions L x W x H	6.69"L x 2.68"W x 1.26"H
Item Highlight	Heater Controller 120V~1200W Temperature Control for Aquarium Breeding Reptiles Hatching
Item Weight	0.47 kg
Material Type	Plastic
Model	306A
Number of Items	1
Operating Temperature	20 °C
Unit Count	1 Count
Voltage	120 volts

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€ 118.84

Duties & taxes included

In stock

Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Greece.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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3 weeks ago

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