Water Heaters
Hot Water Heaters: Compact and Self-Contained
Hot water heaters are incredibly efficient in a variety of settings and environments, and under-sink water heaters can fit in most Vanity Units because they are incredibly compact. Some examples of where hot water heaters would be beneficial include small industrial units with single washrooms, as well as loft conversions and outbuildings.
Our Ariston water heaters are also great energy-saving options with eco-friendly benefits, as they deliver hot water instantly, so you don’t need to keep the water running to reach the temperature you need. Commercial Washrooms also sells a range of Ariston accessories required for installing under-sink water heaters.
Looking for a product that you can’t see on our website? Or looking for more information on some of our other Electrical Products, such as Commercial Hand Dryers and Washroom Ventilation? Please email or call us, and we’ll see if we can help you find what you need.
Water heater FAQ
What is a water heater?
A hot water heater is an appliance used in both domestic and commercial settings that uses gas or electric energy to heat and store water. They are used to supply users with hot water instantly.
What are the benefits of a water heater?
- Instant hot water - since they can store boiling water, you don’t have to wait for your hot water supply, and you can get what you need in seconds.
- They’re more eco- friendly - as you’re getting hot water faster, you can cut down on your water usage.
- They can be compact, which allows them to fit snugly in a vanity unit under a sink.
- They're energy-efficient because they can convert all the energy they intake into heat.
- You can save on installation costs, as under-sink water heaters can be installed inside vanity units, reducing the need for complex installation.
Do you need a boiler and a hot water heater?
Boilers and water heaters serve different purposes. The difference between a boiler and a hot water heater is that boilers are designed to heat large volumes of water for whole-building heating, whereas hot water heaters supply appliances such as taps and showers with hot water. Hot water heaters can supply this hot water instantly as they store boiling water from the water supply.
How does the hot water heater work?
Hot water heaters give you a constant supply of hot water. Under-sink water heaters can be installed in a vanity unit or under a counter below your sink, and they simply connect to your cold tap. Typically, the water heater system includes three parts: a heating and holding tank, an inline filter, and a faucet. Once you turn on your tap, hot water will immediately be available and run out. As hot water leaves the heating tank, more filtered cold water enters the holding tank, where it will be heated.
Please bear in mind that you may also need to acquire the following accessories:
- An expansion vessel is used to support the expansion and contraction of water in your water heater.
Pressure-reducing valve - A tundish - this ensures that the pressure inside the water heater doesn’t rise too high as the water enters.
- If you’re unsure whether you will need these items, speak to a plumber who can take a look and advise you.
Can a hot water heater leak?
Yes, a hot water heater can leak, which is why it’s a good idea to check and service it regularly. If you notice that your water heater is leaking, turn off the water supply right away, and you may need to call a plumber to fix or replace it.
How do I know the water heater is full?
When your water heater is full, you will be able to run your hot water tap normally (i.e no remaining air seeps out).
How to service a water heater
Water heaters can last many years without servicing; however, you can reduce the risk of damage to the tank and improve its efficiency by regularly servicing it. If you need to service your water heater, hire a professional plumber to do the work for you, who can check whether it is working properly.




