Natural and renewable thermal energy is available everywhere in large quantities.

We use the Earth to store it, water to transport it and the sun to heat you.

WATINYOO, the energy is in you !

Our values

WATINYOO was born in 2017 with a clear project:to propose to project owners and operators a different approach to energy management based on the use of local, natural, immediately available resources and not expensive and centralized infrastructures.

By integrating the end user into the production process, his relationship with energy is profoundly changed and a more virtuous behavior is induced.

The concept WATINYOO concept integrates all the elements of the production of thermal energy (heating, cooling, DHW), but also the electrical energy necessary for this production (primary energy).

energy saving
GHG emissions (CO₂)
fossil fuels
years of ROI

Our offer

WATINYOO uses soil to produce and store heat by installing a water loop as a means of transportation and distribution.

By regulating the temperature of the loop using geothermal energy and additional collectors (waste heat, grey water, solar energy), WATINYOO systems obtains an optimal input temperature. The heat pumps (HP) connected to the loop thus benefit from a stable temperature throughout the year, allowing them to reach (or even exceed) their maximum Coefficient of Performance (COP).

Additional heat sources (always free and natural) make it possible to supplement the thermal kWh requirements.


  • Heating Oil or Gas + DHW electric: COP 2.5
  • Aerothermal heat pump: COP 4.5
  • WATINYOO Basic Installation: COP 7.3
  • Complete WATINYOO installation : COP 14,3
WATINYOO Basic 48.6%

WATINYOO uses THE EARTH to store heat, produce it or dissipate it by means of a large diameter water loop (Ø 225 mm) installed 1.50 m deep.

Geothermal baskets are used to regulate the temperature of the loop.

The system thus benefits from a high thermal stability throughout the year in order to supply the HP connected to the system.

THE WATER is a naturally heat transfer element. To prevent any risk of pollution in case of accidental leakage, WATINYOOdoes not add any additives in the water contained in the loop.

HP draw from water the energy necessary for their optimal functioning.

The SUN is the main source of natural energy. WATINYOO recovers it from capture points (eg PV/T hybrid solar panels) to provide additional energy to the whole.

PV/T panels cover the electrical energy needs necessary for the operation of the equipment.



MUTUALIZATION OF Renewable energies

WATINYOO uses renewable energies, naturally available and abundant for a better performance. We pool resources to optimize their efficiency. We use robust and mastered technologies for a better durability of the installation.


An ultra short R.O.I. (<5 years)and reduced operating costs.


Coverage at 100 needs (heating, cooling, ECS).


100% renewable energy, no CO₂ or GHG emissions.


Shared and self-regulating heating network

It is often said that the cheapest energy is the one we do not consume… our vision of efficiency also includes cost control.

First of all, the installation costs; each project is the subject of a detailed study to evaluate several possible solutions and the synergies that can result from their implementation.

Then operating costs; we select components for their high efficiency (to ensure production at a lower cost), durability (to ensure long-term operation) and low carbon footprint (for a reduced environmental cost).

This approach based on cost control allows us to offer you a very short return on investment (less than 5 years) for a very long installation life (at least 50 years).

Up to 100% coverage of thermal needs (heating, cooling, DHW).

To ensure your thermal comfort at all times, we install in our systems many intelligent sensors (using communication technologies) in order to be able to react to the slightest change in temperature.

Every second, the operation of the system is evaluated and compared with the set point parameters and external parameters (temperature, sunshine, etc.).

The control and regulation units that equip our facilities use artificial intelligence (AI) technologies to modulate the operation of the system by integrating in real time various parameters such as temperature histories, weather forecasts and pre-established scenarios of site use.

In the case of a renovation project, the WATeBOX management system can integrate existing equipment (heat distribution units, solar or photovoltaic panels) into the operation of the system.

100% renewable energy, no CO₂ or GHG emissions.

It makes no sense to propose a heat management concept without integrating environmental preservation values.

For WATINYOO, not only does energy only make sense if it is renewable, but heat production must be eco-responsible by limiting the impact on the environment.

The solutions we propose are based on a circular analysis of the need to limit unnecessary production. For example, a heating requirement and a domestic hot water (DHW) requirement are often treated separately when they could be shared…

In this example, we would propose a heat pump (HP) to cover the need for heating and DHW at the same time. In addition, by combining hybrid solar panels (heat recovery photovoltaics) with it, we cover a large part of the HP’s primary energy needs (electrical) while providing the bulk of the thermal energy needs for the production of DHW. This is energy that is not wasted and heat that is not produced unnecessarily.

Through this approach, we contribute to the reduction of GHG (Greenhouse Gases) and of CO₂ emissions on our equipment. It’s good for the planet.

The heat pumps (HP) are connected to the water loops installed in the ground, thus benefiting from an ideal inlet temperature for a maximum COP.

By associating the water loops with each other, by means of plate heat exchangers, we create a micro intelligent heat network (SmartGrid thermal) able to ensure the transfer of the calories required by the different WATeBOX connected.

Thanks to the WATeBOX(control and regulation unit), each installation can automatically communicate with the other installations in the network in order to transmit heat requests or respond to requests initiated by other WATeBOX within the same network.

The extension of the network makes it possible to increase the number of additional renewable energy collection points (roof, grey water, etc.) and, consequently, to contribute to improving their performance.


WATINYOO proposes a circular approach to heat management, based mainly on the use of naturally available renewable energy sources. The capture and management of these heat streams uses proven technologies, recognized for their robustness. By associating several technologies with each other, we create a synergy whose result is an unprecedented energy efficiency …


Real heart of the installation, the WATeBOX is responsible for the control and regulation of energy flows.

It manages the automatic regulation of the elements (sensors, pumps, probes, etc.) that ensure the operation of the system.

It exchanges with the network its operating data and heat requests (transmitting or receiving).

Finally, it ensures the recording of contributions to the network, thus enabling each subscriber to benefit from a remuneration corresponding to his contributions.

The plate heat exchanger

Plate heat exchangers are used to connect water loops together to create heating networks.

The metal plates allow heat exchange without hydraulic connection between two loops.

With high thermal efficiency (95 % heat transfer), the exchangers allow heat to be transferred from one loop to another almost without loss.

Hybrid photovoltaic panels

Hybrid photovoltaic (PV/T) panels are designed to produce electrical energy from solar radiation (photovoltaic) and convection heat from solar thermal energy.

The installed PV/T surface area (optionally combined with batteries) covers all or part of the electrical energy needs of the installation (heat pump + accessories) while providing additional heat that can be used for the production of DHW.

The water loops

We use a temperate water loop (maintained at around 15°C) to supply the heat pumps (HP) connected to it.

Made of a Ø 225 mm high-density polyethylene (HDPE) pipe for a length of several hundred meters, the water loop allows a large quantity of liquid to be stored.

The water contained in the loop will draw the natural heat from the ground (geothermal principle) at a depth of 1.50 m.

Unlike aerothermal heat pumps (which draw heat from the ambient outside air), water-loop heat pumps benefit from an optimum temperature all year round for much higher efficiency.

Heat recovery from waste water

The heat of the shower and bath water (around 30 °C) can be recovered to provide the water loop (or directly to the CAP) with a complementary caloric intake.

This free heat can be used for DHW production, heating or to help regulate the temperature of the water loop.

Geothermal heat pumps

The efficiency of a water heat pump is much higher than that of an air heat pump (using the heat from the outside air).

The coefficient of performance (COP) of an air heat pump is 4.5 (or 4.5 thermal kWh produced for every 1 electrical kWh consumed) when that of a water heat pump (with water at 15 °C) reaches 7.3 (or 7.3 thermal kWh produced for every 1 electrical kWh consumed).

Geothermal baskets

The geothermal baskets consist of a polyethylene pipe (Ø 25 mm) arranged in a spiral over a height of 2 to 3 m.

Installed in the ground (-4.50 m), they contribute to the regulation of the geothermal water loop by capturing heat from the ground (or dissipating excessive heat from the loop).

Each basket (diameter of 1.20 m) represents an Exchange length of the order of 100 m for a thermal power of 700 to 1200 W depending on the nature of the terrain.

The waste heat

The heat released by an equipment during its operation (for instance, an engine) is called waste heat.

By capturing and channeling this free energy source, it can be integrated into the heat production system, thereby reducing primary energy requirements.


WATINYOO is in the spotlight on Hympulse with an interview with Armand Menargues, President of WATINYOO, by Nicolas EYNAUD from Fay.

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