External Heater Question

[kiriyama]

Hi , I have a Hydor ETH 300w on my external filter, I was wanting to put another one on the other filter but the company I wanted to use don't have them in stock, I can probably source one elswhere but was wondering if there are other alternative makes of external filter I could use, the tubing on the filter is 16mm
Any feedback/advice on this would be really appreciated

 

[N0body Of The Goat]

Rena Smart Heaters (go to at least 300W, can be had on ebay for ~£23) can be hooked upto 16mm piping via a seperate connection kit that cost £6-50 on Ebay at mo.