How long will the settings be retained when the power is taken off?

You can safe the settings by turning P7 ON

Can I use this controller to switch a 250v ac aquarium heater? Thanks in advance

The relay should be able to handle that providing the heater doesn't draw more than 10A, which I imagine it doesn't as it would turn your aquarium into a kettle. Be aware that this unit is powered from a 12V supply. You can buy similar units that can be powered from the mains (such as https://www.amazon.co.uk/dp/B089RKGW5C/) if you don't want/have a separate power supply.

Will it keep the settings if the power is cut

I disconnect this when charging up the car battery to which it is connected. The settings are retained during this time.

Can you set a hysteresis value for the SET temperature (so the output stays on until temperature drops below the hysteresis)?

No. This is a simple switch on switch of the heater once the set desired temperature is set.

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Aideepen W3230 20A 12V Digital Thermostat, Digital Temperature Controller Regulator Heating Cooling Control Thermometer Instrument

Aideepen W3230 20A 12V Digital Thermostat, Digital Temperature Controller Regulator Heating Cooling Control Thermometer Instrument

Product ID: 226331276

Details

Brand
Aideepen
Colour
1Pack W3230
Item weight
50 Grams
Material
Polycarbonate
Voltage
12 Volts

⚡20A max current

⏱️0.5s refresh rate

🌡️Accurate ±0.1°C temp control

HK$138

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Description

🌡️ Take control of your climate like a pro — precision meets power!

RAPID RESPONSE TIME - Updates every 0.5 seconds to keep conditions perfectly stable
DUAL MODE FLEXIBILITY - Seamlessly switch between heating & cooling to fit any environment
SMART DELAY CALIBRATION - Protect your devices with start delay & fine-tune temp accuracy
CUSTOMIZABLE SAFETY ALERTS - Set max/min temp alarms to prevent costly mishaps
PRECISION TEMPERATURE MASTERY - Ultra-accurate 0.1°C measurement for flawless climate control

The Aideepen W3230 is a compact, 12V digital thermostat designed for precise temperature regulation from -55°C to 120°C with 0.1°C accuracy. Supporting both heating and cooling modes, it features a fast 0.5-second refresh rate, customizable alarms, temperature calibration, and start delay functions. Ideal for professional-grade applications requiring reliable, adaptable climate control with a 20A max load capacity.

Specifications

ASIN	B08DD9LNZL
Best Sellers Rank	15,872 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 17 in Temperature Controllers
Brand	Aideepen
Colour	1Pack W3230 12V
Country Of Origin	China
Customer Reviews	4.2 4.2 out of 5 stars (406)
Included Components	W3230 Digital Temperature Controller1 + Instruction Manual1
Item Weight	50 Grams
Manufacturer	Aideepen
Manufacturer Part Number	A7012442
Material	Polycarbonate (PC)
Number of Items	1
Number of Packs	1
UPC	782940081775
Voltage	12 Volts

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HK$138

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In stock

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