Compact 300W Heater

[DEL 707]

I've been adding equiptment to my sump and things have got a bit cramped.
My D-D Titanium 300W is VERY close to touching the walls on my sump.

Can anyone recommend a heater? Good enough for 250l and slightly shorter then my current titanium?
According to the website, the titanium 300w is 256 mm long.

I have an inkbird, so I don't need to worry about a controller.

 

[commod0re]

Innovative Marine Helio heating elements are among the smallest titanium ones I’ve seen at any given wattage so far, the 200W element is 177mm (7 inches) long, you could do a 2x200W with a single controller