Lämpöässä Esi, Emi, Eli

Lämpöässä Esi, Emi, Eli

For demanding pieces of real estate from private houses to detached houses and industrial real estates

Flexible solution for ground source heating systems

E-model series is designed for demanding pieces of real estate from private houses to detached houses and industrial real estates.

Lämpöässä Esi is suitable for new and renovated private houses, terraced or semi-detached houses, industrial real estates and farms. Due to its compact size, Esi -series can be placed to small and narrow spaces (e.g. basements). Lämpöässä Esi is a great solution for buildings, where the current heating system remains as parallel/backup system alongside ground source heating.

You can get ground source heat for blocks of flats, terraced houses and detached houses with Lämpöässä Emi and Eli. Also industrial real estates, public buildings and farms are possible to heat with Lämpöässä Emi- and Eli- ground source heat pumps.

Lämpöässä Groud Energy Centre is the factory installed heating centre ready to use.

Comprehensive control system for ground source heat pump

Comprehensive control system for ground source heat pump

ÄssäControl control systems’ touch screen and function shortcuts make the use of a ground source heat pump easy. It is even possible to remote control and monitor the equipment over the Internet with tablet or smart phone. There are cooling and solar connections as standard in Lämpöässä Esi.

Made in Finland

Made in Finland

Lämpöässä ground source heat pumps are made in Finland. Lämpöässä has produced ground source heat pumps for harsh Finnish conditions already 30 years.
100% Geothermal heat

100% Geothermal heat

Full power Lämpöässä ground source heat pump produces all of the energy required for heating and hot domestic water without heating elements.
Parallel operation

Parallel operation

Parallel operation ground source heat pump produces heat and hot domestic water in a stable and simultaneous manner regardless of the circumstances.
Triple circuit control

Triple circuit control

Triple circuit control facilitates real estate temperature control. One of the circuits can be used for controlling hot domestic water temperature. Accessory.


The ÄssäControl control system allows controlling the Lämpöässä Esi ground source heat pump over the Internet. Accessory.
All inclusive

All inclusive

Lämpöässä’s comprehensive delivery package spares the customers from unexpected additional expenses, and the product installation is quick and easy.

Technical specifications

Control system
Area heated, m2
Esi 6.0: 100 - 150
Esi 9.0: 100 - 200
Esi 11.0: 140 - 240
Esi 14.0: 200 - 300
Esi 17.0: 240 - 400
Emi 22/22P: 300 - 500
Emi 28/28P: 400 - 600
Emi 43/43P: 400 - 600
ELi 60/60P: 600 - 900
ELi 90/90P: 800 - 1300
Heating power kW, 0/35°C
Esi 6.0: 7,86
Esi 9.0: 10,13
Esi 11.0: 11,96
Esi 14.0: 14,55
Esi 17.0: 17,00
Emi 22/22P: 22,42 / 20,71
Emi 28/28P: 29,52 / 26,75
Emi 43/43P: 46,19 / 42,83
ELi 60/60P: 60,69 / 58,13
ELi 90/90P: 91,03 / 86,24
Dimensions, mm (w x d x h)
Esi: 595 x 680 x 1450
Emi: 920 x 680 x 1450
Eli: 1200 x 680 x 1450
Hot water storage tank
Esi and Emi 22/22P: 500 - 1000 l
Emi 28/28P: 1000 - 1500 l
Emi 43/43P: 2000 - 3000 l
ELi 60/60P: 2000 - 5000 l
ELi 90/90P: 2000 - 5000 l
Weight, kg
Esi 6.0: 174
Esi 9.0: 178
Esi 11.0: 192
Esi 14.0: 202
Esi 17.0: 210
Emi 22: 395
Emi 28: 395
Emi 43: 410
Emi 22P: 387
Emi 28P: 387
Emi 43P: 402
ELi 60/60P: 515 / 505
ELi 90/90P: 605 / 595
Esi 6.0: 3 x 10 (16) A
Esi 9.0 - 17.0: 3 x 16 (20) A
Emi 22/22P: 3 x 25 A
Emi 28/28P: 3 x 25 A
Emi 43/43P: 3 x 50 A
ELi 60/60P: 3 x 63 A
ELi 90/90P: 3 x 100 A
Power supply
400 V 3N~
Technical room
Front panel colour

A ground source heat pump can extract geothermal heat from soil, water bodies or a bore hole. The Lämpöässä E-series heat pump units are used with separate water tanks which store the heat energy produced by the heat pump. In addition, it is possible to connect multiple water tanks in parallel. Esi models utilise Lämpöässä superheating technology that takes care of heating and final domestic hot water heating simultaneously. Due the technology, immersion heaters are not required upon normal use.

If the need for hot domestic water is low, Lämpöässä can be connected without the superheating feature with separate storage tank. In case the building includes previously installed water tank that is suitable for geothermal heating, it can be connected to Lämpöässä heat pump.

More specific technical details can be found from the manuals: https://www.lampoassa.fi/en/products/brochures/

Solution with separate storage tank:

ratkaisu jaetulla erillisvaraajalla_Ts2

Solution with separate storage tank with intermediate floor:

ratkaisu jaetulla erillisvaraajalla_Ts2

The ÄssäControl control system developed and manufactured by Lämpöässä is used in all E-series heat pump units by default. It allows controlling the operation of the entire geothermal energy system as concerns heating, hot domestic water production, and cooling alike. Thanks to touch screen and function shortcuts it is very easy to use ÄssäControl. The control system collects history data and analysis of this data allows more efficient and economical control over the entire system.

There is also optional remote control available for ÄssäControl (WLAN, 3G, fixed network), which enables remote monitoring of the system.

Cooling applications and many other additional accessories available for E-model pumps. A few examples of accessories are:

Control system for multiple heating circuits

The standard package of a Lämpöässä geothermal heat pump includes a control system for one heating circuit. A control system for two or three heating circuits is also available, enabling different areas within the household to receive heating water of different temperatures. For instance, one temperature for floor heating and the other for a radiator network, or one temperature for the humid rooms and the other for the rest of the household.

Delivery package for two heating circuits includes in addition to standard delivery also pre-installed control system application, valve actuator, the actuator mounting kit, three-way valve, A-energy class heating circuit pump and flow sensor.

Remote access of ÄssäControl

The heat pump unit’s remote access allows the user to monitor and control the operation of the geothermal heat system via the Internet with e.g. a tablet or a smart phone. Remote access is possible in many different ways: via a wired cable web connection, via a WLAN modem or 3G. In addition, ÄssäControl is available with a remote alarm function in case of possible disturbances.

ÄssäControl DPV room sensor

The room temperature sensor measures the current room temperature, according to which it adjusts the temperature in the direction of the desired set temperature, keeping the room temperature nicely even.


The E -series heat pump units are used with separate water tanks.
This makes it possible, if necessary, to place the pump even in small and confined spaces.

A wide range of different sizes of water tanks is available:

– 500 L
– 700 L
– 1000 L
– 1500 L
– 2000 L
– 2500 L
– 3000 L
– 4000 L

(Includes 6-10 kW electrical immersion and 2 x 45 L hot water coils.)

Accessories available for storage tanks:

Additional coil

The additional coil available for the superheaters allows the use of solar energy as a source of additional heat.

Change of coil from 45l-> 60l

Switching the coil to a larger size makes it possible to raise the temperature in the water tank.

Third hatch

Acid resistant coil

Coil made of acid resistant steel for pool water heating

Additional fee for detachable panels

Lowering the water tank

Additional electrical resistance

Complements the heating of hot water.