Heating systems and heat pumps

Q: Who is permitted to fill heat pumps with refrigerants such as R290?

Heat pumps may only be filled with refrigerants such as propane (R290) by qualified personnel with a valid certificate for working with refrigerants. This is required by law, as these substances are flammable and environmentally hazardous.

It works when it's sealed: safely checking heating systems and heat pumps

No detours during commissioning, renovation and maintenance

Leak tests are a must – especially for modern heating systems with heat pumps or water-based underfloor heating. Our digital testing devices offer reliable results, intuitive operation and complete documentation.

Brief overview

✔ Suitable for heat pump systems, heating circuits and underfloor heating
✔ Support during commissioning, renovation and maintenance
✔ Digital test reports – legally compliant & immediately available
✔ Compact, robust devices – ready for immediate use
✔ Fast Esders service – personal & competent

Digital documentation

Easy compliance with standards and guidelines

Competent service

Better understanding of a busy schedule

Made in Germany

High quality and personalised technical support

Digital protocols as they should be

Our measuring devices record all test values digitally, including start and end pressures, test time, minimum and maximum values.

The Esders Connect app automatically saves the results, creates test reports and, if required, can also send them automatically by email – no paperwork, no rework.

Fast service when it matters

Heating and heat pump systems can be complex. Our customer service is not.
Whether you need spare parts, a mobile service team or help with documentation, we offer reliable assistance exactly when you need it – without any unnecessary delays.

For greater quality in the system

Our devices are developed and manufactured in Haselünne with the aim of making work on the construction site easier and safer. Whether it’s load testing on the heating pipe, leak testing before the screed or the serviceability test according to TRGI: with Esders, specialist tradesmen and utility companies are on the safe side.

Before heating systems can deliver their full performance, it must be clear that there are no leaks and no safety risks.

Devices for everything that flows warmly through pipes

Our devices are developed to meet the requirements for testing heat pumps and heating circuits. They provide reliable measurement results, are intuitive to use, and save valuable time through digital data recording – especially for tightly scheduled tasks and parallel work.

Our TONIs for testing heating systems and heat pumps

                
                    TONI CombiTest R                Robust, precise digital pressure gauge for differential pressure measurement. Illuminated graphic display with menu navigation for accessing minimum and maximum pressure, start and end pressure, as well as pressure drop. Can also be used as a refrigerant gas detector with a remote sensor in the gooseneck. Refrigerant concentration is displayed on the screen. Leakage alarm thanks to a switchable audible and visual alarm as well as a quiet vibration alarm.

Common refrigerants are detectable according to EN 14624, including R290, R32, R134a, and R1234yf.
Operating time:
up to 140 hours as a digital manometer with a fully charged battery, without illumination, and at an ambient temperature of 20°C

up to 17 hours in detection mode with a fully charged battery, without illumination, and at an ambient temperature of 20°C.
Gooseneck length: 34.5 cm
Housing dimensions: 13 cm x 6.5 cm x 3 cm
Device weight: approx. 270 g
To the shop

                    TONI GasTest R                Refrigerant gas detector with a remote sensor in the gooseneck. Refrigerant concentration is displayed on the screen. Leakage alarm thanks to a switchable audible and visual alarm as well as a quiet vibration alarm.

Common refrigerants are detectable according to EN 14624, including R290, R32, R134a, and R1234yf.
Operating time: up to 17 hours in detection mode with a fully charged battery, without illumination, and at an ambient temperature of 20°C.
Gooseneck length: 34.5 cm
Housing dimensions: 13 cm x 6.5 cm x 3 cm
Device weight: approx. 270 g
To the shop

                    TONI PT HP10                Robust, precise digital manometer for differential pressure measurement in the low pressure range, as well as a high-pressure port. Backlit graphic display with guided menu sequences for tests according to regulations.

Measuring range:
    Low pressure: 0 – 2000 mbar
    High pressure: 0 – 10 bar / 0,1% accurancy
Operating time: approx. 140 hours with fully charged battery, without backlight and at 20°C ambient temperature
Housing dimensions: 16.5 cm x 6.5 cm x 3 cm
Device weight: approx. 280 g
To the shop

                    TONI PT HP 25                Robust, precise digital manometer for differential pressure measurement in the low-pressure range, as well as a high-pressure port. Backlit graphic display with guided menu sequences for tests according to regulations.

Measuring range:
    Low pressure: 0 – 2000 mbar
    High pressure: 0 – 25 bar / 0,1% accurancy
Operating time: approx. 140 hours with fully charged battery, without backlight, at 20°C ambient temperature
Housing dimensions: 16.5 cm x 6.5 cm x 3 cm
Device weight: approx. 280 g
To the shop

Related products: testing accessories for heating systems

Suitable connection cables, adapters, or transport bags: our accessories expand the possibilities of our device technology and ensure that you remain flexible even on changing construction sites.

House connection set water

House connection set water for DruckTest GaWa Included: Art.: 262031 - connection hose GaWa, length: 1 m Art.: 262032 - Adapter 1" int. thread fits to Gardena Art.: 262033 - Adapter 3/4" int. thread fits to Gardena Art.: 262034 - Adapter 1/2" int. thread fits to Gardena Art.: 262035 - Adapter 1/2" ext. thread fits to Gardena Art.: 262036 - Adapter 3/8" int. thread for angle valve Art.: 262037 - Adapter 1/4" ext. thread for drain valve Art.: 262038 - Adapter M22 int. thread for diffusor Art.: 262039 - Adapter M24 ext. thread for diffusor

Compact Compressor CC 60

Compressor KK 60 for Pressure-Tests on house connections for gas/water Oil-free, operationally safe compressor for pressurization of gas and water pipes Technical specifications Type: piston compressor, 2 integrated fans for engine and cylinder Power supply: 230 volts, 50 Hz, P = 505 W, Air flow: > 60 l / min, and> 40 l / min at 3 bar Pressure reducer: adjustable output pressure 0.5 bar to 10 bar Operating temperature: - 10 ° C to + 45 ° C Dimension: width 30 cm, depth 22 cm, height 22 cm Weight: 10 kg

Soft case for TONI

Secure storage of the TONI in a custom-fitted device mount. Outer dimensions 272x152x67 mm

Esders blog: information about heating systems and testing processes

Blog

Measure leakage rates, test operational readiness, and more

All testing options for gas installations with the TONI FlowTest When it comes to gas installations, the question isn’t simply: Is it leak-tight or not? Depending on whether you’re inspecting an existing system, performing a repair, replacing a gas meter, or commissioning a new installation, different tests are required. Leakage rates, pressures, and pressure curves can provide important insights into the condition of a system. However, correctly interpreting the measured values is just as crucial. For example, a serviceability test

18. September 2026

Blog

Pressure and leak test of underfloor heating system

Table of Contents The pressure in underfloor heating is essential to ensure that this type of climate control system works properly, is safe and has a long service life. Before activating an installation, it is essential to carry out a pressure or leak test to confirm that there are no leaks or losses in the system. This test is not only a technical requirement, but is also stipulated by special regulations. In this article, we explain the correct pressure for

11. June 2025

Contact

Regional Sales Manager

Daniel Hartmann

    
            place
        
            Office in Dortmund
        
            phone
        
            +495961/9565-2668
        
            mail
        
            daniel.hartmann@esders.de
        
            smartphone
        
            +491511/9565021

Regional Sales Manager

Bennett Hoffmann

    
            place
        
            Office in Haren
        
            phone
        
            +495961/9565-2611
        
            mail
        
            bennett.hoffmann@esders.de
        
            smartphone
        
            +49151/41640652

Frequently Asked Questions

There is no such thing as an unnecessary question; there are only too few answers. That is why we are continuously working on listing important questions and answers for test procedures in the field of heating systems here.

When must a heat pump be tested for leaks?

Before commissioning a heat pump, a leak test is mandatory – especially for new installations or after repairs to the pipeline. This ensures that leaks can be ruled out and standards such as DIN 1988-2 and EN 806-4 are complied with.

What needs to be considered when testing underfloor heating systems for leaks?

The leak test should be carried out before screed or floor coverings are laid. Our digital measuring devices automatically record all pressure curves and document the results in a legally compliant manner – ideal for new builds and renovations.

How does the digital documentation of measurement results work?

The Esders Connect app allows you to automatically save and compare all test reports and send them as PDF files or emails – directly from the construction site. This saves time and simplifies the process of providing evidence to clients or testing centres.

Can I use one device to test both heating systems and heat pumps?

Yes, many of our measuring devices are designed to reliably test both gas installations and heat pump lines. This allows you to efficiently monitor changes in the system without having to switch devices.

Who is permitted to fill heat pumps with refrigerants such as R290?

Heat pumps may only be filled with refrigerants such as propane (R290) by qualified personnel with a valid certificate for working with refrigerants. This is required by law, as these substances are flammable and environmentally hazardous.