Award Winning Ground Source Heat Pump
The Energy Awards - 2024
Physical Technology of the Year - Heating and Cooling
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- Product information
- Advantages
The NIBE S1256 Ground Source Heat Pump is designed to make everyday living quietly comfortable and reliably efficient. Quiet Mark certification means it runs with minimal noise, so it won’t disturb day-to-day life. With an A+++ energy rating and the naturally steady temperature of the ground, it delivers consistent warmth across the seasons, with efficiency levels up to six times that of a gas boiler.
Fitting the S1256 is straightforward and flexible. It’s available in two outputs so your installer can choose the right size for your home, and its built-in inverter technology automatically adjusts how hard it works to match your heating needs, gently increasing or decreasing output to maximise comfort. A 180-litre hot water cylinder is built into the heat pump, which is ideal for properties where less hot water is required or there is limited space for a cylinder. If you’d like summer comfort too, variants with built-in passive cooling can take the edge off warmer days, providing heating in winter and gentle cooling in summer.
The S1256 is compatible with the myUplink app, so you can check in and adjust settings from your phone or tablet whenever you like. Choose a NIBE Pro installer and you’ll get an extended warranty for extra peace of mind. Additionally, the S1256 is eligible for FlexiServ; servicing carried out by NIBE’s own engineers to keep everything running smoothly.
The system also plays well with others: it can integrate with NIBE ventilation accessories, solar inverters, pools, or an additional heat source to create a complete home solution. And because it’s eligible for the £7,500 Boiler Upgrade Scheme grant, you can reduce upfront costs as you move to low-carbon heating.
Quiet Mark Certified
Quiet operation, as certified by Quiet Mark, ensures minimal disruption to daily life and outdoor enjoyment.
A+++ energy rating
Our most efficient heat pump ever made, therefore helping to lower running costs
Compatible with NIBE's accessories and other third party inputs
Integrate with a NIBE ventilation system, solar panels, pool, additional heat source and more
- Technical Data
- Documents
NIBE RMU S40
Wireless touchscreen controller
NIBE FLM S45
An exhaust air module that recovers heat from indoor ventilation air and transfers it to the brine circuit, boosting the efficiency of the connected ground source heat pump. It also provides mechanical ventilation, improving indoor air quality while helping reduce the size of the ground collector needed.Compatible with S-Series heat pumps.
NIBE PCM S40
Enable passive cooling by circulating cool brine (ground loop fluid) directly to the heating system, such as underfloor. PCM S40 is for S-Series heat pumps up to 8kW. Functionally the same as as the PCM 40, but aesthetically different to match the S-Series
NIBE PCS 44
Provides passive cooling by circulating cold fluid from the ground collector loop through a building’s cooling system.
NIBE ELK 8
NIBE ELK 42
Three phase back-up electric immersion heater - 42kW
NIBE SRV 10
NIBE ELK 5
NIBE ELK 26
Three phase back-up electric immersion heater - 26kW
NIBE POOL 40
An accessory that allows pool heating using heat pump. Max 18 kW. The heat pump controls the reversing valve, pool circulation pump and any heating circuit circulation pumps via POOL 40.
NIBE ELK 15
Three phase back-up electric immersion heater - 15kW
NIBE ACS 45
4-Pipe Passive/Active Cooling Accessory
NIBE AXC 40
The AXC 40 is an accessory card paired with NIBE domestic Ground Source Heat Pumps such as the SXX56 range, used to control and communicate with additional systems, such as extra climate systems, shunt-controlled additional heat, step-controlled additional heat, passive cooling, active cooling, etc.
NIBE CDS 10
Wireless temperature, humidity & CO₂ sensor to be paired with NIBE S-Series controllers
NIBE ROT 10
Wireless room thermostat
NIBE KB 25
Filling and flushing kit used during the installation or maintenance of a ground source heat pump system. Allows filling or topping up of the brine circuit. For heat pumps up to 13kW.
NIBE ECS 41
Extra heating circuit (maximum 80-250 m2 floor heating). ECS 41 is used when heat pump is installed in houses with up to four different climate systems that require different flow line temperatures, for example, in cases where the house has both a radiator system and an under floor heating system.
NIBE THS 10
This wireless sensor allows you to read the temperature and humidity in a room or climate zone using the myUplink app. On the heat pump you can see the current room temperature or change it in °C. THS 10 replaces the fixed indoor sensor. Because it is battery powered, it is easy to install. Mount the sensor in your room and connect it to your NIBE S-Series heating installation.
NIBE EME 20 UK
Communication module that translates Modbus RTU, from a solar inverter, to Modbus TCP/IP, for the heat pump to control the solar inverter
NIBE HR 10
A relay box accessory that acts as an interface between the heat pump and external devices, e.g. immersion heaters, cooling modules, external heat sources. It lets the heat pump turn other equipment on / off depending on the systems needs.
NIBE ECS 40
Allows the heat pump to control a second heating circuit (zone) with a different temperature requirement. For up to 80 m² of underfloor heating
Height (mm)
1800
Width (mm)
600
Depth (mm)
620
Net weight (kg)
231
Product efficiency class room heating, 35 °C
A+++
Product efficiency class room heating, 55 °C
A+++
System efficiency class room heating, 35 °C
A+++
System efficiency class room heating, 55 °C
A+++
Efficiency class water heating
A+
Volume water heater (l)
180
Refrigerant volume, CO² equivalent (ton)
0,54
Declared tap profile
XL
This product is Quiet Mark certified
NIBE is proud to have received Quiet Mark certification for this heat pump, recognizing its exceptional low-noise performance. Quiet Mark is an internationally recognized certification awarded to products that meet rigorous standards for noise reduction, ensuring quieter and more comfortable living environments.
Learn more about our Quiet Mark certificationRelated Products
Smart Accessories
Our S-Series range is designed to be combined with our smart home accessories to create an efficient climate system for your home.
myUplink
Our S-Series range is designed to be used with myUplink to create an efficient climate system for your home.
ERS S10-400
The NIBE ERS S10-400 is designed for installation with a NIBE ground or air source heat pump for a complete heating and ventilation system.