Below you can find the answers to the main questions related to the sectors in which Emmeti operates. Choose a topic to find out more!

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Underfloor heating and cooling

Floor heating systems, or underfloor heating, allow you to optimise all the spaces in your home by making use of a large surface for heating the room. To operate this type of system, you only need a floor temperature of 25-29°C, which can be obtained by circulating water at 35-40°C (compared to the standard 60-70°C of radiator systems). Under these conditions, heat loss is significantly reduced and the heat pumps or condensing boilers can be put to better use, cutting consumption considerably.
In an underfloor heating system, the heat is mainly based on irradiation, creating optimal comfort. There will no longer be hot and cold areas because the heat will be evenly distributed throughout the room, from the floor to the ceiling, keeping the part of your body warm that usually gets cold first, i.e. your feet.


Rooms can be cooled by circulating cooled water in the pipes and using the floor as a cold radiant surface. To do this, firstly the water temperature must be checked and therefore, of the floor (generally between 20 and 22°) and the humidity present, using specific control panels which control the specially installed dehumidifiers. If the underfloor system is correctly designed, it can both heat and cool, guaranteeing comfort all year round.


The cooling system combined with electronic control panels and humidifiers that control the humidity in it, prevent the formation of condensation, mould and unpleasant odours, ensuring comfort and reduced energy consumption.


When heated, the surface temperature of the floor generally fluctuates between 25 and 29°C. Under these conditions, air convection, typically seen in radiator systems, does not occur. The heat, therefore, is transmitted mainly by irradiation and does not stir up dust. Using an underfloor heating system is beneficial for anyone suffering from asthma or allergies because the dust no longer comes into contact with boiling hot radiators and does not burn which is the cause of irritation and the classic black marks on walls.


This is quite normal because inverter heat pumps, such as Mirai SMI by Emmeti, operate by producing/consuming very little energy, and prevent inefficiency by switching on and off. This is the ideal operating condition for an underfloor system.


The cooling system must be properly designed and fitted with electronic control panels and dehumidifiers. It may not be possible to convert an underfloor heating system into a cooling system, if it has not been pre-configured for this purpose during installation. For a more comprehensive answer, you should contact your system designer and installer.


Yes, the system is compatible with any type of flooring: parquet; ceramic, gres porcelain and clay tiles; marble, Venetian terrazzo. If the floor is wood, it must be no more than 2-cm thick.


Yes, you can adjust the temperature in every single room.


Yes. Photovoltaic panels proud energy which feeds the heat pumps. In turn, they generate energy to the underfloor radiant system, guaranteeing heat in the winter and cooling in the summer.


Yes. Thanks to a heat pump which works during the day and when the sun is out, the heat is stored in the floor which then, heats the rooms during the night.


A big advantage is that during the summer, the heat pump (see Mirai SMI) can work as a cooling system and the radiant underfloor system becomes a cooler, fitted with specific humidity and water temperature controller.


Heat pumps

A heat pump exploits the cooling cycle to transfer heat from outside air to the water which circulates in the heating system. In other words, it extracts heat from a natural source, i.e. the outside air, which is cooled by the cooling cycle based on the condensation and evaporation of the refrigerant gas and on the thermal energy which is absorbed or released during these transitions. The heat is then transported inside the building at the ideal temperature. The same principle is exploited in heating and cooling systems, configured for heating in the winter, even if, in this case, the air in the room is heated and not the water which circulates.


Mirai SMI heat pumps by EMMETI have been designed and have undergone extensive testing at -20°C, guaranteeing heating even in the coldest climates. The heat pump should obviously be chosen based on your heating requirements, calculated by the heating technician during the design phase, for each building.


EMMETI has chosen to focus on Mirai SMI which has a complete built-in cooling circuit. This means it can be installed quickly and safely without having to set up lines for the circulation of the cooling gas and produces hot water directly. EMMETI can, however, also supply Mirai Split which is a heat pump with an internal and external unit.


Yes. The Mirai SMI inverter heat pump can control a 3-way valve positioned on the outside and the desired water temperature can be configured directly on the unit.


How often the magnesium anode, installed on the heat pump for producing DHW, is checked depends on the characteristics of the water. For safety reasons, it should be checked at least once every six months.


The R32 refrigerant gas has been developed to improve the environmental impact if it is dispersed in the environment and at the same time to improve the efficiency of the heating and cooling system. This gas has a low GWP value (Global Warming Potential) and its use allows harmful greenhouse gas emissions to be reduced by about a third compared to R410A gas. Moreover, machines working with this gas require a lower amount of refrigerant compared to the same units working with R410A.
To find out more, download the data sheet on heating and cooling systems or watch the video on refrigerant gases.


Domestic hot water

The LEDs on the electronic anode indicate correct connection and operation. If the electronic anode is connected correctly, the green LED will come on.


Yes, absolutely. Ice can form inside the solar thermal panel even above 0°C if the night sky is clear.


The cost of photovoltaic systems has dropped considerably over the last few years, also increasing the production of electric energy in each module. Legislation has also introduced the obligation to produce increasing amounts of energy from renewable sources for heating and cooling buildings. On the basis of these considerations, photovoltaic modules are the most widely used solution in new systems, even though solar thermal panels are still frequently used and remain a valid solution for heating domestic hot water.


A suitably sized electric element can heat DHW, but it has an efficiency equal to 1, i.e. it consumes 1Kw and transmits 1kW to the water. The heat pump can achieve an efficiency of about 5, so it consumes 1 kW, but transmits up to 5 to the water. A heat element, therefore, can be used in certain applications, but where possible, it is definitely more convenient to use a heat pump.


Yes, it can, even it is used as a water cooler during the summer. Mirai SMI should be combined with a boiler of a suitable size based on the system, in which the water for domestic use will be heated and kept hot.


Air exchange

Because thanks to the constant air exchange, the CMV (Controlled Mechanical Ventilation) keeps the room clean, preventing the formation of mould, smells and condensation without wasting energy.


Because the continual exchange of air maintains low humidity in the rooms and greatly reduces the risk of condensation forming on the colder walls which would otherwise result in the formation of mould.


Absolutely not. Emmeti heat recovery units are designed and built to keep noise to a minimum and make the CMV virtually unnoticeable.


The mould has probably appeared after replacing the windows and/or installing an insulation coating which has eliminated drafts and reduced transpiration of the building towards the exterior. The simplest remedy is to install an air renewal system (Mechanical Ventilation) which, in addition to reducing the formation of mould, will also improve the air quality inside the building.


Photovoltaic systems

Simply because the heat pump works with electricity which can be produced by the photovoltaic modules. To optimise this combination, EMMETI has developed the Febos HP control system which enables self-produced energy during daylight to be exploited, by storing it under the flooring, cutting down the need to use mains electricity as far as possible.


Obviously, on cloudy days or winter nights, power must be taken from the mains network, but on balance, you should consider the amount of energy fed into the network during the summer months and how much is consumed (Exchange Contract on-site with your electricity provider to enhance energy not used for home consumption). Since the energy, that is not consumed in the home and fed into the mains network, is purchased at a higher rate than it is sold, it is important to exploit the energy produced as far as possible. For this reason, EMMETI has developed Febos HP which allows you to store the thermal energy produced during daylight hours (by using up electricity in the home), and heat the floor which releases heat during the night, avoiding the need to switch on the heat pump.


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