Instantaneous & Instant Boiling Water Heaters

Instantaneous water heaters deliver hot water on demand without the need for stored capacity, making them ideal for commercial environments where space, efficiency and reliability matter. Commonly referred to as instant or tankless water heaters, these units heat water as it flows through the system, eliminating standing heat loss and providing a continuous supply.

What Is an Instantaneous Water Heater?

An instantaneous water heater uses a high-performance electric heating element to raise water temperature as it passes through the unit. Unlike hot water storage systems or unvented cylinders, there is no stored volume of heated water, helping to reduce standby heat loss and improve overall energy efficiency.

These systems are particularly suited to point-of-use applications, where hot water is required close to the outlet. For smaller installations, explore our Point-of-Use Water Heaters designed for compact, localised supply.

Instant Hand Wash & Commercial Applications

Electric instantaneous water heaters are widely used in hand-wash basins, sinks, and light-commercial environments. Our range includes compact Hand Wash Water Heaters for washrooms and healthcare settings, as well as higher output units suited to commercial kitchens and staff facilities.

Installers benefit from streamlined installation, fast heat-up times and reduced maintenance compared to traditional cylinder-based systems. These units are ideal where space is limited and consistent hot water delivery is essential.

Instant Boiling Water Units for Offices & Hospitality

For environments requiring continuous boiling water, such as offices, catering areas and hospitality kitchens, wall-mounted instant boiling water heaters provide a premium alternative to traditional storage-based systems. Designed for higher demand applications, these units deliver rapid recovery and energy-efficient performance in commercial settings.

Whether specifying a compact hand-wash heater or a commercial boiling-water system, Heatraq supplies reliable, manufacturer-approved solutions for professional installers and facilities managers across the UK.

Frequently Asked Questions About Instantaneous Water Heaters

What is the difference between an instantaneous water heater and a boiling water unit?

An instantaneous water heater heats water as it flows through the unit, supplying hot water on demand for sinks, basins and small commercial outlets. A boiling water unit, such as a wall-mounted Zip system, is designed specifically to deliver continuous boiling water for offices, catering areas and hospitality kitchens. While both operate without stored cylinders, boiling water units are engineered for higher temperature output and greater commercial demand.

Are instantaneous water heaters energy efficient?

Yes. Because instantaneous heaters only heat water when required, they eliminate standing heat loss associated with traditional storage cylinders. This makes them an efficient solution for point-of-use applications, particularly in environments where hot water demand is intermittent.

What size instantaneous water heater do I need?

The correct size depends on flow rate, outlet type and demand frequency. Small 3L–5L units are typically suitable for hand wash basins and light office use. Larger capacity boiling water systems are better suited to commercial kitchens and hospitality settings where continuous supply is required.

Can an instantaneous water heater supply multiple outlets?

Some electric instantaneous heaters are designed for single outlet use, such as hand wash basins. Higher specification models can supply multiple outlets, but system sizing must account for simultaneous demand and electrical capacity.

Are wall mounted boiling water heaters suitable for commercial kitchens?

Yes. Commercial wall-mounted boiling water heaters are widely used in offices, staff kitchens and hospitality environments. They provide rapid recovery, consistent temperature control and improved energy performance compared to traditional kettles or storage-based systems.

Do instantaneous water heaters require special installation?

Most electric instantaneous heaters require a dedicated electrical supply and appropriate water pressure. Installation should always be carried out by a qualified professional to ensure compliance with electrical and plumbing regulations.