In many households, cold water flows out of the tap before it gets warm — an unnecessary waste of time, energy and water. But there is a solution that combines convenience and efficiency. Discover how an inconspicuous component can revolutionize everyday life.

‍

‍

What is a hot water circulation pump?

A circulation pump is a pump that continuously circulates hot water in a closed circuit. As a result, hot water is immediately available at every tap point, without long waiting times. This saves water, increases comfort and reduces energy losses due to cooling in the pipes.

‍

What is it for?

With a circulation pump, hot water is immediately available at every tap, without waiting times. At the same time, it saves water because no cold water flows away unused. It also contributes to drinking water hygiene. The constant movement of water in the pipes significantly reduces the risk of germ formation, such as legionella. In conjunction with modern heating systems, it also ensures more efficient use of energy and minimizes heat losses in the pipes.

‍

How does a circulation pump work?

A circulation pump works by continuously moving hot water in a closed pipe system. As soon as hot water is not used at the taps, it cools down in the pipes. The circulation pump pumps this cooled water back into the hot water tank or boiler, where it is reheated. At the same time, fresh, heated water flows back to the taps through the circulation line. As a result, the water in the pipes remains constantly warm.

‍

Where are circulation pumps used?

Circulating pumps are used in various types of buildings:

• single-family homes: Here, the pump ensures that hot water is immediately available at every tap. This increases living comfort and saves water.
• multi-family houses: In larger buildings, the circulation pump ensures that all residential units are supplied with hot water reliably and without long waiting times.
• commercial buildings: In hotels, restaurants or hospitals, a continuous supply of hot water is particularly important. Hygiene regulations must be met here and user comfort is paramount.

There are differences between private and commercial applications:

• private applications: The focus is on comfort and water savings. The pumps are often smaller and are controlled by timers or thermostats.
• commercial applications: Compliance with drinking water hygiene is key here. Commercial circulation systems are larger in size, operate continuously and are often equipped with additional monitoring and control systems to meet regulatory requirements.

When is a circulation pump mandatory?

A circulation pump is mandatory for drinking water systems with long pipes or in buildings in which the hot water system has a volume of more than 3 liters between the tank and the remotest tap. The requirements of the Drinking Water Ordinance (TrinkwV) and DIN 1988-200 must then be met. The focus here is on drinking water hygiene, in particular the prevention of legionella.

This applies to apartment buildings, public institutions and commercial buildings such as hotels or hospitals. In single-family homes, there is generally no obligation as long as the above conditions do not apply.

What types of circulation pumps are there?

Circulating pumps are available in various designs, which differ in function and efficiency. The choice of the right pump depends on the location, individual requirements and the desired energy saving measures. Basically, the following types are differentiated:

‍

What is the difference between circulation pump and heating pump?

The main difference lies in their function. A circulation pump ensures the continuous movement of hot water in a drinking water system. A heating pump, on the other hand, transports heating water in the heating circuit.

‍

How much does a circulation pump cost?

A circulation pump costs 50 to 400 euros, depending on the type of pump. Simple basic models are cheaper. High-efficiency pumps with modern technology cost more, but make savings possible in the long term. In addition, up to 300 euros are added for installation and around 50 euros every few years for maintenance.

‍

‍

How is a circulation pump installed?

To install a circulation pump, there must be a pipe system with a circulation line. Suitable connections and sufficient space near the hot water tank are required. In addition, a power connection is required to operate the pump electrically.

The following is a step-by-step installation guide:

1. Planning and preparation
   • Check the piping system and ensure that a circulation line is available.
   • Select the right pump based on system requirements and energy efficiency.
   • Shut off the water supply for safe work.
2. Installing the circulation line (if not available)
   • Route a separate line from the remotest tap back to the hot water tank.
   • Connect the pipe to the existing hot water system.
3. Assembly of the pump
   • Secure the circulation pump to the return pipe.
   • Make sure that the flow direction is set correctly (note the mark on the pump).
4. Electrical connection
   • Connect the pump to the power supply.
   • Optional: integrate control systems such as timers or temperature sensors.
5. Filling and venting the system
   • Fill the hot water system with water.
   • Remove air from the pump and lines for trouble-free operation.
6. Start-up and test
   • Switch on the pump and check the circulation.
   • Make sure that all taps provide hot water immediately and that there are no leaks.
7. fine adjustment
   • Optimizing energy consumption by setting timers or temperature sensors.
   • Check the functionality and efficiency of the system.

‍

When is a circulation pump worthwhile?

A circulation pump is worthwhile when you want the convenience of an immediate hot water supply without waiting times. Especially in larger buildings or long pipes, it saves water and increases efficiency. They also ensure drinking water hygiene and prevent the formation of germs such as legionella.

‍

Can a circulation pump be retrofitted?

A circulation pump can be retrofitted, provided that the existing pipe system is suitable for it. Ideally, a circulation line should already be available. If not, it must be installed additionally, which requires more effort. The retrofit should be carried out by a specialist. This ensures optimal function and safety.

‍

Can a circulation pump make noise?

A circulation pump can make noise, especially if it has not been installed correctly or if there are defects. The causes can be vibrations, air in the system or an excessive flow rate. However, modern high-efficiency pumps usually operate quietly. Professional installation and regular maintenance minimize potential noises.

‍

Efficient energy solutions for a sustainable future

Discover how autarc can help you plan and implement your energy projects — from consultation to installation. Take advantage of this opportunity and book a free demo. Convince yourself of the benefits without obligation and experience how easy and efficient our calculation tools make your work easier.

‍

‍