Nibe S1256 (1.5–8 kW)

Specifications and technical data

✓ BUS eligibleGround Source (GSHP)ResidentialR454B1.5–8 kW

Manufacturer	Nibe
Model	S1256
Model code	S1256-8
Heat pump type	Ground Source (GSHP) All Ground Source heat pumps →
Application	Residential All Residential heat pumps →
Refrigerant	R454B All R454B heat pumps →
Mode	Heating only
Heating capacity	1.5–8 kW
Max heating output (low temp)	2.85 kW at W0/W35
COP (heating)	5.05 at B0/W35
SCOP (heating)	5.67 at W55
Operating range (air)	-12 to 35 °C
Heating flow temperature	20–65 °C
Power input	0.56 kW
Electrical supply	Not stated
Dimensions (H×W×D)	1800 × 600 × 620 mm
Operational Weight	211 kg
Sound power level	43 dB(A) (Sound Power LW(A))
Data added	2026-07-01
Data source	Manufacturer Data Sheet
Verification	Verified by a human
Boiler Upgrade Scheme	✓ BUS eligible — Listed on the Ofgem BUS Product Eligibility List (24 Sep 2026). Grant also needs an MCS-certified installer and a qualifying system design. Funding guide
PEL certificate no.	012-C700186 issue 1
MCS certification	✓ MCS listed
MCS certificate no.	012-C700186 issue 1
MCS listing	View on MCS ↗

Free data sheet (PDF) →

View manufacturer page →

Nibe S1256 is a 8 kW ground source heat pump, using R454B refrigerant.

Where to buy (UK)

UK Supplier	Baxter Heat Pumps
UK Supplier	IMS Heat Pumps

✎ Suggest a correction to this data

Data is compiled from manufacturer sources and may contain errors or gaps. Always confirm specifications with the manufacturer before making decisions.

Reviews & further reading

Manufacturer S1256 Ground Source Heat Pump — Nibe
Manufacturer Nibe S1256 — Nibe
Review NIBE S1256 ground source heat pump review — Federation of Master Builders
Review Nibe S ground source heat pump review — Federation of Master Builders
Covers the Nibe S ground source range generally, including the S1256.
Review NIBE S1256-13 Heat Pump — Quiet Mark