Geothermal products & geothermal energy | Distribution shafts/geothermal shafts, geothermal distributors & Co.

Manifold systems for geothermal energy development

So that you can complete your project as planned

GNV on site:
Trade fair Geotherm 2025

We will be on site again this year: Visit us at our stand (Edeka-Arena Stand 87) at GeoTHERM on 20 + 21 February 2025 in Offenburg!

Tickets and a review of our stand at GeoTHERM 2024:

Geothermal energy - the sustainable heating solution from single-family homes to cold local heating networks

Our high-quality manifold chambers and precise control valves enable use in all load classes and offer you as an installer the opportunity to realise the highest energy yield with minimal operating costs. Our geothermal manifolds help to maximise the energy efficiency of your systems and minimise maintenance costs for your customers.

Geothermal heating is the sustainable heating technology of the future – for detached houses as well as for sophisticated cold local heating networks and large-scale geothermal systems. Our plastic manifolds offer you customised solutions that are perfectly matched to ground collectors, geothermal probes and energy piles. Whether you are installing a manifold chamber for a detached house, a latest-generation geothermal manifold for larger geothermal projects or a complex manifold system for a cold heating network – with our products you are ideally equipped.

Thanks to the high flexibility of our systems, you can choose the right solution for every project – from small detached houses to more demanding local heating projects. The innovative design of our manifold chambers enables fast, efficient installation that saves time and money.

Our high-tech products give your installations a decisive competitive edge and fulfil your customers’ requirements for sustainability and energy efficiency.

Innovative manifold systems for maximum energy efficiency and durability

The future of modern heating technologies lies in CO2-neutral heat pumps. As an installer, you know that maximum energy efficiency, durability and quality are in demand, especially in the field of geothermal heat pumps. We have set new standards worldwide in this area and, as a specialist, we offer you innovative manifold systems that are optimised to meet the requirements of the geothermal and ice storage industry.

The requirements for manifold systems are becoming increasingly complex, and GNV GmbH has already specialised in these challenges. Particularly in specialised areas such as marine desalination plants or liquid battery systems, we already offer you the right technology to implement sustainable water and energy supply projects.

Maximum flexibility and versatility are particularly important for large-scale projects. Our plastic manifold systems can be installed directly in the building via floor ducts or used in manifold chambers with a load class of up to D400. No matter how complex the project is - with our systems, you always have the right solution to hand.

Every construction site that cannot be completed costs time and money

You may be familiar with the situation: the building is finished, the holes for the necessary connections have been drilled. You have done your job reliably as always. But then your suppliers let you down. Manholes and materials are not delivered on time. This causes major problems that put you under enormous pressure.

We don't think that's necessary!

You can rely on everything going according to plan. At any time. At any location.

Fast production

Save time and nerves. We produce at short notice and individually.

Reliable delivery

You manage your project without stress because our service arrives on time and in the right place.

Personal contacts

Talk to us. We are at your side and can solve any challenge together. Even on the construction site.

Our products

Geothermal heating manifolds

The geothermal manifold is an important device for hydraulic balancing of the geothermal probe, for venting the system and for individual control of the probes.

Geothermal manifold chambers

Chamber for installation of the geothermal heating manifold outside the building. A manifold chamber keeps condensation away from the building, provides easy access for technicians and eliminates the need for a mechanical room.

Well access pits

Our well access pits made of plastic chambers are significantly lighter, do not require complex core drilling, have prefabricated connections and can be installed quickly. These are advantages that conventional concrete rings do not have.

Ice storage systems & energy fences

We can offer our ice storage systems and energy fences in all variants thanks to our high level of automation.

Overview - Our products


Description		GN Box Mini	GN R Mini	GN R Compact	GN R Medium	GN 1	GN 2	GN 3	GN X1	GN X2
Number of ground loop circuits		2 to 4 ports	2 to 3 ports	2 to 6 ports	2 to 8 ports	2 to 16 ports	2 to 24 ports	20 to 100 ports	2 to 24 ports	2 to 44 ports
Dimensions (mm)	Diameter / L x W	620 x 420	Ø 510	Ø 600	Ø 800	1,156 x 856	1,556 x 1,156	3,064 x 2,147	2,060 x 1,400	3,040 x 1,400
Dimensions (mm)	Height	460	715	850	1,150	1,150	1,150	1,867	1,580	1,580
Chamber cover	Load class	not walkable	A 15	A 15 / A 35	A 15 / A 35	A 15	A 15	A 15	A15/A35/B125/D400	A15/A35/B125/D400
Chamber cover	Telescopic cover	-	-	○	○	○	○	○	■	■
Connection diameter (mm)	Ground loops	Ø 32 to 50	Ø 32 to 50	Ø 25 to 50	Ø 25 to 50	Ø 25 to 50	Ø 25 to 50	Ø 25 to 63	Ø 25 to 63	Ø 25 to 63
Connection diameter (mm)	Heat pump	Ø 40 to 63	Ø 40 to 63	Ø 40 to 75	Ø 40 to 110	Ø 40 to 160	Ø 40 to 160	Ø 40 to 250	Ø 40 to 225	Ø 40 to 225
Manifold series		Type: I	Type: I	Type: I, L	Type: I, L	Type: I, L	Type: I, L, U	Type: I, L, U	Type: I, L, U	Type: I, L, U
With verifiable structural calculation		-	-	-	-	-	-	-	■	■
Installation in foundation slab		-	-	○	○	-	-	-	■	■
Option	Anti-flotation protection	-	-	-	-	-	-	-	○	○
	Main isolation valve	-	○	○	○	○	○	○	○	○
	Circuit balancing valves	-	○	○	○	○	○	○	○	○
	Lifting eyes	-	-	○	○	○	○	○	■	■
	Strainer	-	○	○	○	○	○	○	○	○

■ = Standard ○ = Optional - = not available


Description		GN Manifold Standard	GN Manifold with Wall Mount	SEB - System with Floor Penetration	SEB - System with Wall Penetration
Number of ground loop circuits		Min.: 2 connections	Min.: 2 connections	Min.: 2 connections	Min.: 2 connections
Diameter of manifold header (mm)		Ø 63 to 400	Ø 63 to 400	Ø 63 to 400	Ø 63 to 400
Connection diameter (mm)	Ground loops	Ø 25 to 63	Ø 25 to 63	Ø 25 to 63	Ø 25 to 63
Connection diameter (mm)	Heat pump	Ø 40 to 400	Ø 40 to 400	Ø 40 to 400	Ø 40 to 400
Manifold series		Type: I, L, U, custom designs	Type: I, L, U, custom designs	Type: I, L, U, custom designs	Type: I, L, U, custom designs
Configuration	Plastic flow meters (l/min)	2-12 \| 8-28 \| 5-42 \| 35-70	2-12 \| 8-28 \| 5-42 \| 35-70	2-12 \| 8-28 \| 5-42 \| 35-70	2-12 \| 8-28 \| 5-42 \| 35-70
	Ball valve (mm)	DN: 25 \| 32 \| 40 \| 50	DN: 25 \| 32 \| 40 \| 50	DN: 25 \| 32 \| 40 \| 50	DN: 25 \| 32 \| 40 \| 50
	Additional measuring equipment and valves	Pressure gauge, thermometer, auto air vent, circuit balancing valves	Pressure gauge, thermometer, auto air vent, circuit balancing valves	Pressure gauge, thermometer, auto air vent, circuit balancing valves	Pressure gauge, thermometer, auto air vent, circuit balancing valves
Option		Main isolation valve, manifold mounting, strainer	Floor penetration plate, main isolation valve, manifold mounting, strainer	Floor penetration plate, main isolation valve, formwork plate, frame system	Wall penetration plate, main isolation valve, formwork plate, frame system or wall mount

Details on equipment and dimensions can be found in the respective product information for the manifold systems

Our awards

Working with us is very easy

Step 1

You call us.

Step 2

We will advise you and find the right solution.

Step 3

You receive manifold chambers and materials in the right place at the right time.

We want you to be able to work as you have planned

We know from experience how nerve-wracking it is when important materials are not delivered on time. That is why it is particularly important to us that you can always rely on our service.

on the market for 18 years
over 400 customers
over 3000 orders per year
fully automated welding processes
800 m² production area
in-house product and tool development

Customer opinions

Jan Kluge, Project Manager Geothermal Energy, Daldrup & Söhne AG Germany
"We have been working with GNV GmbH for many years and are extremely satisfied. The delivery speed and service are unique in the industry."

Leonard Gjokaj, Managing Director Sibold Haustechnik Brugg AG Switzerland
"Sandro and his team exceeded my expectations. The delivery was on time, the quality of the products was excellent, and the customer service was top-notch. Thank you for the great experience!"

Kristof Lenders, Karl Lenders Well and Pump Construction GmbH Germany
"I have been a customer of GNV for years and have never been disappointed. Their reliability and high product quality make them my preferred manufacturer for manifold chambers. Absolutely recommended!"

David Frühwirth, Project Manager Civil Engineering Porr Bau GmbH Austria
"As a business customer, I appreciate the professional and reliable cooperation with GNV GmbH. Their flexibility and commitment to customer satisfaction are impressive. I look forward to more successful projects with them."

What sets us apart from others

We know that everything has to go according to plan when developing geothermal energy. The correct manifold chambers and fittings must always be on site when they are needed. Unfortunately, the reality is often different: Long production and delivery times for geothermal components mean that most construction projects cannot be completed on time and pressure builds up.

That's how many of our customers used to feel.

That’s how many of our customers used to feel.
We think it must be easy to make geothermal energy accessible as an energy source. And we understand how important it is for you to be able to rely on suppliers. That’s why we make sure that our manifold chambers and systems are always on site when they are needed. We now have over 400 customers who trust us as a reliable supplier of geothermal manifold chambers and ice storage systems.

Give us a call right away. You will no longer have to worry about unreliable suppliers and late deliveries. Instead, you will have your materials when you need them and can be sure that everything will go according to plan.