Master craft business in Mannheim-Seckenheim

Heat Pumps, Heating & Plumbing

Living comfort from a master-led craft business

Whether air-source, ground-source or water-source heat pump: we rely on the technology of the future!

Request a consultation Call the emergency line

Office hours: Mon - Thu 7 am - 3 pm and Fri 7 am - 12 noon, phone 0621 / 33 16 41

Premises of GEDE GmbH with air-conditioning unit, Mannheim-Seckenheim, heating, plumbing, heat pumps

Founded in 1991
Master-led
Own customer service
Emergency service
Stiebel Eltron partner
Training company

Living comfort and warmth

Our customers' legitimate wish for comfort and warmth is our goal.

Energy is a sensitive topic, and it presents us with particular challenges. What is needed are modern, innovative solutions at fair terms - exactly what we deliver as a qualified craft business.

Genuine living quality with everything that goes with it: well-being, bathing pleasure, and effective savings on energy costs.

If you have any further questions: simply email or call us! Email: info@gede-gmbh.de Phone: 0621/33 16 41

Heat pump unit on a house wall, GEDE GmbH Mannheim

Our services

Heating installation, heat pumps and plumbing - from a single source

GEDE Mannheim, heating system in a single-family house

GEDE GmbH pictogram of a heating system, district heating

Heating installation

In new builds and old buildings alike, the heating must fit the individual house:

Heat pump heating
Certified district heating
Hybrid solutions (gas, oil, district heating)
Oil and gas condensing boilers with solar thermal

Heat pumps

In new builds, a heat pump is now standard - and for many existing buildings it is a future-proof solution. As a heating system it uses renewable energy. To make real sense, the house should have good thermal insulation and/or underfloor heating. Correct planning and a high seasonal performance factor increase the heat pump's efficiency and make it more climate-friendly.

Plumbing

Plumbing installation in the home covers the complete water supply and waste-water system, right through to bathroom planning and execution.

Bathroom planning... Renovations call for a delicate touch and experience, because solutions that pose no health risks are our goal.

Customer service

Office hours: Mon - Thu 7 am - 3 pm and Fri 7 am - 12 noon, phone 0621 / 33 16 41

We offer our customers a dedicated in-house service for all heating systems we have installed. This allows us to help quickly and reliably when problems arise, because we select our products and suppliers with care. The required spare parts are usually in stock or can be ordered directly - often a professional adjustment and fine-tuning of the system is all it takes.

Emergency service: Outside business hours, our customers have an emergency service available for burst pipes, heating and hot-water failures! 0621 / 33 16 41

Nine white vehicles and vans parked on the premises of GEDE GmbH

Heating installation

Legal requirements

New-build pictogram for the legal heating requirements from 1 January 2024, GEDE Mannheim

Existing-building pictogram for heating requirements, GEDE Mannheim

In new development areas

Heating with at least 65% renewable energy

Outside new development areas

Heating with at least 65% renewable energy from 2026 at the earliest

Working or repairable heating

No heating replacement required.

Irreparable heating

Pragmatic transitional solutions apply.

Switch to heating with renewable energy now and take advantage of the funding.

Request a consultation

Air/water heat pump • Water/water heat pump • Ground-source heat pump

The right heat pump for your home

Efficient heating with renewable energy

Homeowners often find it hard to decide on the right heating technology. An alternative to conventional combustion systems such as oil and gas heating is the heat pump. It uses thermal energy stored in the air, ground or water and extracts heat for your home.

What is a heat pump?

A heat pump is a system that uses the thermal energy stored in the environment to heat buildings. Unlike wood, oil or gas heating, it works without combustion, via a sophisticated technical process. Low-temperature thermal energy is raised to a higher level.

Pros and cons of a heat pump

Advantages

low heating costs

independence from price swings of fossil fuels

financing possible via state subsidies

conservation of fossil resources

CO₂-free operation

Disadvantages

comparatively high purchase costs

the building must meet certain energy standards first (insulation, windows, building envelope...)

high electricity demand

more noise if the outdoor unit is unfavourably placed

Depending on which energy source can be tapped at your house, different systems come into question.

1. Air-source heat pump: the flexible all-rounder

The air-to-water heat pump is the most commonly installed system. It extracts heat from the outside air and transfers it to the heating water. The unit can be installed outside or inside the building.

• Special feature: it is quick to install and cost-efficient.

2. Ground-source heat pump: power from the earth

This system uses the constant temperature level of the ground. The energy is harvested either via a borehole probe (deep drilling) or ground collectors (laid over a large area below the frost line).

• Special feature: because the ground stays warm even in the depths of winter, this system works extremely efficiently and consistently.

3. Water-source heat pump: peak performance from groundwater

Here, groundwater serves as the heat source: it is drawn from a supply well and, after use, returned via an injection well.

• Special feature: groundwater is the most effective heat supplier, making this the most efficient (but also most planning-intensive) variant.

While the air-source heat pump scores with low investment costs, ground- and water-source heat pumps win through minimal operating costs in the long run.

In the heat pump field, we have been working with STIEBEL-ELTRON for years.

What should you look out for when buying?

You get the best possible comfort and high efficiency when the pump is matched to the house and your heating habits. That is how you achieve a heating solution that is economical and ecological in the long term.

In older buildings, the following measures must be implemented first:

Correct heat-load calculation
Refurbished building envelope (windows, facade and other elements)
Flow temperatures as low as possible through surface heating
Sufficient storage size for the hot-water demand
Legal requirements for the installation site
Combination options (for example with photovoltaics)

Request a consultation

Yannik Kopp standing with arms crossed in front of the GEDE GmbH building wall

R290 seal for natural refrigerant in Stiebel-Eltron devices

Yannik Kopp, energy efficiency expert at GEDE GmbH, at his desk

Funding · dena · BAFA · KfW

Funding & energy consulting from a single source

Our new managing director, Yannik Kopp, will be an officially accredited energy efficiency expert for residential buildings from Q3 2026.

His building analyses bring enormous added value to our customers.

As future energy efficiency expert for residential buildings, Yannik Kopp covers the following areas:

Consultation, application and processing (build supervision) of state funding for existing buildings and new builds. (dena, BAFA, KfW)
Issuing energy performance certificates for residential buildings
Advising homeowners on all questions of energy-efficient refurbishment to increase energy efficiency
and much more.

Since April 2025 we have been supporting our customers with all funding matters ourselves. This includes all documents required for the funding and help with the online application via "Meine KfW" and the Mannheim climate protection agency.

Request a consultation 0621 / 33 16 41

Bathroom & plumbing

Plumbing

In plumbing, we take on the entire construction process on request, from planning to the finished bathroom. You pick your favourite fittings and ceramics stress-free at our cooperation partner, Richter & Fenzel, and we take care of the rest. We are also happy to coordinate site management and recommend proven trades from our network.

Our focus is on plumbing installation for residential spaces. From system planning to the final installation, we pay attention to the highest quality and precision.

Our services include, among others:

1. Water installation: we plan and install efficient water supply systems that meet the individual requirements of your property. From laying the pipework to installing fittings and water meters - we ensure a reliable, trouble-free water supply.

2. Waste-water disposal: we take care of the professional waste-water disposal of your property. With our expertise and modern techniques, we ensure efficient drainage and treatment of waste water. We install drain pipes, lifting stations and backflow valves to guarantee reliable waste-water disposal.

3. Repair and maintenance: in addition to installation, we also offer comprehensive repair and maintenance services. Our team of specialists is available to resolve any problems quickly and efficiently.

We are at your side for the planning, installation and maintenance of your sanitary systems. Our goal: first-class solutions for all plumbing needs.

We work closely with our network partners to deliver execution of the highest quality. From stylish bathroom fittings to modern shower enclosures.

Customer satisfaction comes first for us. We place great value on high-quality work, on-time completion and transparent communication.

Request a consultation

Bathroom planning with drawings of the possible layout over a bathroom photo, GEDE Mannheim — ©4th Life Photography/adobe.stock.com

Bathroom with walk-in shower by GEDE GmbH Seckenheim

The GEDE team

The two heads and the crew

GE-DE GmbH was founded in 1991. The two managing directors, Andreas Kersken and Yannik Kopp, are supported by two office staff and twelve trained specialists. The company premises are located in Seckenheim - home to the offices as well as the hall with warehouse and a well-equipped vehicle fleet. The mid-sized business offers its customers a comprehensive range of heating and plumbing services. For over 30 years we have been training "plumbing and heating engineers" in-house. Through GE-DE's thorough customer service, regular maintenance aims to give every system a long service life.

Portrait of Yannik Kopp, managing director of GEDE GmbH — Yannik Kopp Managing director

Yannik Kopp and Andreas Kersken in white shirts in front of a white wall — The management Yannik Kopp & Andreas Kersken

Craftsmen's hands meeting in the centre — The crew One team, one handshake

Customer voices

"From the very start of planning right through to completion, we always felt very well advised. They took plenty of time to discuss the heat pump project with us in detail and to give us real technical insight.

The fitters did a truly great job and always left the site tidy. I can recommend the company without hesitation and would come back to them any time."

David Klug

Careers at GEDE