In this guide we’ll take a look at the best pond heaters for the UK market.
I’ve compared effectiveness, efficiency, pond capacity, and cost
to give you my top recommendations.

What Is The Best Pond Heater?

  • Features
  • Unique design saves energy
  • Prevents water surface freezing
  • Allows pond to breathe
  • Cost
  • Features
  • 100W heating element
  • Prevents water freezing
  • Allows toxic gasses to escape
  • Cost
  • Features
  • High quality design
  • Prevents trapping toxic gas
  • Keeps pond ice-free
  • Cost

More Detailed Pond Heater Reviews

Blagdon Affinity Ice Vent Pond Heater

This Blagdon Affinity Ice Vent Pond Heater is designed to retain an ice-free zone in your pond in even the coldest and harshest conditions. It stops the pond water surface freezing solid and allows co2 to disperse.

This pond heater is suitable for ponds up to 5,000 litres. For larger ponds, more than one unit will be required. The heater will provide adequate warmth when outside temperatures are as low as -10 °C in ponds up to 1.2 metres in depth.

The pond heater works by heating water passing through a cylinder. The Ice Vent Heater will not make your pond warm but is designed to keep a small area free from ice to allow the pond water to oxygenate and any harmful gases to escape.

This pond heater is safe to use, runs on only 50 watts and does not feel hot to the touch. It comes with a 10-metre cable and is guaranteed for two years. I have been using this one for a couple of years now and haven’t noticed any increase in my electricity bill.

This is a very efficient pond heater that does a great job of keeping part of the pond ice free. It is simple to use, small and discrete and great value for money.

Hozelock Pond Heater

The Hozelock Pond Heater has a 100W heating element that creates an ice-free zone in you pond even in the coldest weather. This pond heater floats on the surface of the pond providing an air hole to allow toxic gases to escape and the pond water to be oxygenated. It is easy to set up – you can simply plug it into an outdoor power socket and then float it on the surface of the pond. The pond heater comes with 5 metres of outdoor rubberised cable.

This did an excellent job of keeping a hole in the ice in my pond even in last year’s severe weather. It is very easy to use, simply turn it on at the plug on nights when the overnight temperature is expected to be low. After heavy snow, it is worth checking it and brushing off any snow that has collected on the surface to make sure it stays afloat, and the hole remains open.

NEWATT Anti-Ice Pond Heater

The NEWATT Anti-Ice Pond Heater creates an ice-free area around the unit allowing for toxic gases to escape and the water to oxygenate.

This pond heater has a 100W element and can be used continually in spells of cold weather. The heater consists of an aluminium cylinder, which creates all round heat, covered with a protective plastic casing to make it durable and shock proof. The pond heater sits on a plastic float and birds and insects can settle here for a drink. You can also add bird food to the indents on the float if you wish.

This is an effective and good value pond heater that’s perfect if you want to keep the birds in your garden happy as well as the fish.

Pond Heater Buying Guide

When choosing a pond heater, ensure that it is powerful enough for the size of your pond. If not, it may struggle to keep an ice-free spot. If you do buy a heater and find it’s not quite enough, you can always add an additional one.

Most pond heaters need to be plugged in to an outdoor socket. If you do not have one of these, you will need an electrician to install one for you.


My fish pond has frozen over. What should I do?

You should make a hole in the ice as soon as possible so that levels of co2 in the water do not build up. However, this should be done with care. Never chop a hole in the ice as the vibrations can shock the fish. Also, do not pour boiling water on the ice as this can harm your fish too. Instead, gradually defrost a small hole in the ice with warm water. You do not need to remove all the ice, just enough to provide ventilation.

Once you have done this it is worth installing a pond heater to prevent the problem from occurring again.

What else can I do to keep my pond healthy and well oxygenated in winter?

As many of the toxic gases that occur in your pond come from dead plant material, it is wise to remove as much dead plant matter from your pond as possible before winter sets in. Removing any fallen leaves and in the autumn and early winter will mean there is less decaying matter to create toxic gases. Consider covering your pond with a net if it is close to trees. Otherwise, simply remove as many of the dead leaves and other dead plant material as you can.