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The Best Appliance to Heat Bathwater

Updated on May 26, 2019

Bathwater Not Hot Enough?

There are a lot of reasons why you can have access to electricity but not hot bathwater--or at least not piping hot bathwater. In my case, it is a condo building with a shared hot water tank that is set lower than I like and gets even cooler during busy times of the day. Other people might be dealing with a malfunctioning or undersized hot water tank or just want to heat up a tub on their deck or even outside.


In-Line Water Heaters

There is a range of options that require a plumber such as point-of-use water heaters that are installed into the water supply. This comes with an extra cost, and may not be an option if you are a tenant.

Stove or Kettle

Many online pages recommended heating water in a kettle or on a stove and taking it to the bath. This option is laborious and potentially quite dangerous.

Plug-In Appliance

The general category I decided to use was a safe electrical appliance specifically designed for heating water.

Selecting a Plug-In Appliance

Electricity and water are always a dangerous combination. So it is vital to choose an appliance with the following qualities:

  • It must be specifically designed to heat water.
  • The heating element must have a safety guard to prevent burns or damage to the tub.

You also need to ensure you use a power point that has a fuse and with not be splashed by any water.

There are no appliances specifically made to heat bath water. What you need to look for is a submersible heater or bucket heater. You need it to be able to heat a relatively large volume of water to your desired temperature.

I would suggest looking for a minimum of 1000 watts, able to heat to 130 degrees Fahrenheit or thereabouts.

Do NOT Select a De-Icer

Many heating appliances have the goal of just preventing water from freezing. These are used to keep water drinkable for animals or stop a fish pond from getting too cold in winter. This kind of heater will turn itself of long before the water gets piping hot.

The Best Option

I went through a period of trial and error using heater from Farm Innovators, Allied Precision, and others. I found most of these to be seriously underpowered and to take more than two hours to heat water and to not heat the water enough.

I ultimately found the right product with the 1500W immersion heater from Gesial -- listed below. This heater has a good guard, can be placed fully under the water, and got a full tub of water piping hot in under two hours. That seems to be about as good as it gets with this kind of appliance.


  • Always ensure the heating element is fully covered by water before plugging it in.
  • Pug into a power point with working fuse well away from the water.
  • Unplug and remove the element before entering the bath.


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