I made this thread a few years ago but deleted it so I thought I'd repost it again for anyone struggling with water temps this time of year..
Nice n cheap, easy to make and works a treat..
I got an old freezer off fleabay and a hose pipe, drilled 2 holes in the sides then coiled it round inside and cable tied the hose to the shelf making sure the coiled hose doesn't touch each other then ran a pump from my res..
Once you got the water flowing keep the pump running at all times otherwise the water will freeze inside..
You can control the temps either by using a segment timer or the controller down below..
Simples..
Hope it helps..
Chu..
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