Flow Water Heaters – Efficient Solutions for Small Homes  - Modern devices for heating water in single- and multi-point systems

Flow Water Heaters – Ideal Solution for Small Homes

How Do Flow Water Heaters Work?

Flow water heaters activate when the hot water faucet is turned on. The device begins heating water and drawing energy, delivering hot water directly to the outlet. When the faucet is turned off, the heater stops working, helping save energy. For maximum efficiency, the distance between the heater and the water outlet should be no more than 3 meters to minimize cooling of water in the pipes.

Single-Point Water Heaters

Single-point heaters supply hot water to only one outlet and are typically installed close to where they are needed, such as above or below a sink. Lower-power models (around 3.5 kW) can supply water at a flow rate of 1.5-3 liters per minute, which may not be adequate for some uses. Therefore, models with higher power (from 5 kW) are often preferred and typically require direct connection to the electrical system.

Modern single-point models are equipped with infrared sensors, allowing for touchless operation. The device automatically shuts off after 20 seconds of inactivity, making it ideal for locations requiring high hygiene standards. Special anti-lime heads prevent scale buildup, prolonging the heater's lifespan.

Multi-Point Water Heaters

Multi-point heaters are more powerful, ranging from 11 to 27 kW, and can supply multiple water outlets at once. However, if several faucets are used simultaneously, the comfort level may decrease as the device's maximum flow rate is about 14 liters per minute. To maximize efficiency, it's best to install multi-point heaters centrally, minimizing the length of pipes.

For maximum performance and energy efficiency, it’s advisable to place them as close as possible to the primary hot water outlet, such as in the bathroom, to ensure quick access to hot water throughout the home.

Factors Affecting Heater Performance

The efficiency of a flow water heater depends on several factors:

• Device power,
• Temperature of the incoming cold water,
• Water flow rate through the heater,
• Desired temperature of the outgoing hot water.

Efficiency is higher when the difference between incoming and outgoing water temperatures is smaller. During the summer, when incoming water is naturally warmer, the heater operates at higher performance than in the winter.

Safety and Overheat Protection

Most flow water heaters are equipped with a thermal or pressure switch that protects the heating element from overheating. For installation in humid areas like shower cabins, it's important to choose devices with an IP 25 protection rating, ensuring they’re resistant to water exposure.