The tiniest circulation pump and heater?

[averageaquarist]

I'm building a 30l nano tank, and want the pump and heater to be completely submerged and hidden behind a root.

What is the tiniest pump and heater on the market?

 

[Mescalero]

Don't know about pumps (pump or filter?) but the smallest heaters I've come across are the Amazon, Temu, Aliexpress ones with an external device for temp regulation. They do stop working sometimes for no particular reason though...

Much more reliable are the Aquael Ultra Heaters for twice as much.

 

[averageaquarist]

Just a circulation pump. I won't be needing an actual filter.
I don't trust electric products from Temu, AliExpress and sites like that - I'm too afraid of buying a potential fire hazard.
The Aquael heater looks kinda small, so thanks for that recommendation! 🙂

 

[Little]

For a circulation pump search for 5v usb water pump. Some have adjustable flow. They are pretty much all the same and very cheap.
I use the Aqua EL heaters and recommend them. I like that they are flat. They also allow mounting facing in or out so you can choose where you view the temperature led. This gives a bit more flexibility for hiding it.