Do You Need A Tank For A Boiling Water Tap?
Yes, most boiling water taps require a small tank installed under the sink. This tank heats and stores water at near-boiling temperature so it can be delivered instantly from the tap whenever you need it.
The tank is an essential part of the system. Without it, the tap would not be able to provide boiling water on demand. Instead of heating water each time like a kettle, the tank keeps a small amount of water ready for immediate use.
What Does The Tank Do?
The under-sink tank acts as a compact boiler that heats water to around 98–100°C. It stores the hot water in an insulated container so it remains ready whenever the boiling water tap is activated.
When you dispense boiling water, the system releases water from the tank and then reheats the small amount that was used. This process ensures boiling water is always available instantly.
Where Is The Tank Installed?
The tank is usually installed in the cupboard beneath your kitchen sink. Most systems are designed to be compact so they can fit neatly alongside existing plumbing and cleaning products.
Installation typically involves:
- Mounting the tap on the sink or worktop
- Positioning the heating tank under the sink
- Connecting the tank to the water supply
- Plugging the system into a standard electrical outlet
Once installed, the tank operates automatically and requires very little day-to-day attention.
How Big Is A Boiling Water Tap Tank?
Boiling water tap tanks are usually quite small and designed specifically to fit inside kitchen cabinets. Depending on the system, the tank may hold around 3 to 4 litres of water.
This amount is usually enough for several cups of boiling water before the system needs to reheat additional water.
Do All Boiling Water Taps Use Tanks?
Yes, almost all boiling water tap systems use some form of heated storage tank. Instant boiling water requires energy, and storing heated water in an insulated tank is currently the most efficient way to deliver it quickly.
Some advanced systems may also include additional components such as:
- Water filtration units
- Carbonation systems for sparkling water
- Chilled water units
These extra components may also sit beneath the sink alongside the main heating tank.
Do Tanks Take Up Much Space?
Most tanks are designed to be compact so they can fit easily inside standard kitchen cabinets. While they do take up some under-sink space, manufacturers design them to leave room for normal kitchen storage.
In most kitchens, the tank fits comfortably beside the waste pipe and other plumbing connections.
Maintenance And Care
The tank itself usually requires very little maintenance. However, the system may include a water filter that needs replacing periodically to maintain water quality and protect the heating system from limescale.
Typical maintenance tasks include:
- Replacing the filter every 6–12 months
- Occasional servicing depending on the model
- Ensuring the system remains connected to power
Final Thoughts
Yes, a tank is normally required for a boiling water tap. The tank stores heated water under the sink so the tap can deliver boiling water instantly whenever it is needed.
Although it does take up some cupboard space, the tank is compact and designed to operate quietly and efficiently, making it an essential part of any boiling water tap system.
