Delivery throughout the EU

Aquael Ultra Heater 25 W – Aquarium Heater with Day & Night Mode, 10–25 L

Trusted by 500+ aquascapers

€32,99
  • For nano tanks of 10–25 L
  • Lowers temperature at night automatically
  • ±0.25 °C electronic thermostat
  • Shatterproof flat housing
  • Display shows water temperature

An electronic 25 W heater for nano aquariums of 10–25 litres. A light sensor lowers the water to your night temperature in the evening and warms it back up in the morning, and the shatterproof housing is safe with shrimp and fish.

Fast delivery (1–5 days EU)

Carefully packed and protected

Tips from real aquascapers

Description

The Aquael Ultra Heater 25 W Day & Night is an electronic aquarium heater for tanks of 10–25 litres. A built-in light sensor lowers the water temperature to your night setting in the evening and brings it back up in the morning.

In nature, water cools down at night. The Day & Night function copies that rhythm automatically, without a timer or second controller. The flat, shatterproof plastic housing is safe in tanks with large fish, turtles or rockwork.

Key specifications

Power 25 W
Aquarium volume 10–25 L
Height 16.3 cm
Thermostat Electronic, ±0.25 °C accuracy
Day & Night Automatic, via built-in light sensor
Housing Shatterproof plastic, flat design
Safety Built-in thermal switch
Display Shows current water temperature

How to install

  1. Fix the heater with the double-sided holder in a spot with good water flow, for example near the filter outlet.
  2. Set your day temperature and night temperature.
  3. Wait 15–20 minutes before plugging it in, so the thermostat adjusts to the water temperature.
  4. Check the display after a few hours and fine-tune if needed.

Frequently asked questions

How much does the temperature drop at night?
You decide: you set the night temperature yourself, and the heater moves to it gradually when the room gets dark.

Which size do I need?
This 25 W model is designed for 10–25 litres. Other sizes: 25 W, 50 W, 75 W, 100 W.

Brand: Aquael  |  Category: Aquarium heater  |  Series: Ultra Heater Day & Night

  • Professional support

    Expert help when you need it

  • Delivery throughout the EU

    Delivery to all EU countries

  • Secure payment

    Fast and secure payment options

  • Easy returns

    Лесно връщане и замяна
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FAQ

What makes Aquarium Boutique different from mass-market stores?

We don't sell everything — we sell only carefully selected products, personally tested. Every item is chosen with a clear purpose: to work well and last long. You don't need to guess about quality — we've already done that for you.

Do you ship to my country?

Yes, we ship across all of Europe. For Bulgaria we work with BOX NOW and Speedy — fast and reliable home or locker delivery. For other EU countries we use international courier services.

How quickly will I receive my order?

For orders within Bulgaria, we typically deliver within 1–3 business days. For other EU countries — usually 3–7 business days depending on location.

Can I return a product if I'm not satisfied?

Yes. If something doesn't meet your expectations — contact us. We have a clear and fair return policy. Your satisfaction matters to us and we will find a solution.

Do you offer advice on product selection?

Absolutely. Our team keeps aquariums and knows the products personally. Write to us — we'll help you choose the right solution for your tank, budget and experience level.

Are your products tested and approved?

Yes. Every product in our store has gone through our personal selection and testing process . We only work with trusted brands and don't list products we don't believe in.

What payment methods do you accept?

We accept all major payment methods — credit and debit cards, PayPal, and cash on delivery for Bulgaria. All payments are secure and encrypted.

How can I track my order?

After your order ships, you'll receive an email with a tracking link. You can follow the status in real time directly through the courier's website.