Products

Shoebox NX

With a COP of up to 4.40 - one of the highest on the market for a small heat pump - and an Energy Rated Performance (ErP) of up to A+++, the Shoebox NX is incredibly efficient and, therefore, cheap to run. Coefficient of Performance (COP) benchmarks heat pump quality and efficiency.

  • Ideal for flats, apartments, 2-5 bed properties.

  • 3kW & 5kW Models

  • Could be eligible for 0% VAT on domestic purchases and additional funding off installation costs.*

Performance

Extraordinary performance

For every 1kW of electricity used to run the heat pump, over 4kW of heat is produced – making the Shoebox NX over 400% efficient. It delivers hot water up to 64℃ and can even be configured to provide passive cooling in the summer months. It can be tucked away in a kitchen or airing cupboard, and its pared-back footprint frees up vital storage space in a home.
Low carbon

Unlock low-carbon heating at scale

The Shoebox NX is engineered to ensure housebuilders exceed compliance requirements, including the Future Homes Standard. This easy-to-install, low-maintenance technology enhances the saleability of properties, preparing developments for a low-carbon future.
Compact

Small but mighty

A compact powerhouse, that can be fitted into small spaces. Makes this the perfect solution for new-build and social housing.
Smart

Intelligent heat pump controls

The Passiv Smart Thermostat works seamlessly with Kensa heat pumps to fine‑tune performance in real-time. With out‑the‑box compatibility and intelligent tariff optimisation, it helps lower heating costs while keeping comfort consistent year‑round.
Performance

Extraordinary performance

For every 1kW of electricity used to run the heat pump, over 4kW of heat is produced – making the Shoebox NX over 400% efficient. It delivers hot water up to 64℃ and can even be configured to provide passive cooling in the summer months. It can be tucked away in a kitchen or airing cupboard, and its pared-back footprint frees up vital storage space in a home.
Low carbon

Unlock low-carbon heating at scale

The Shoebox NX is engineered to ensure housebuilders exceed compliance requirements, including the Future Homes Standard. This easy-to-install, low-maintenance technology enhances the saleability of properties, preparing developments for a low-carbon future.
Compact

Small but mighty

A compact powerhouse, that can be fitted into small spaces. Makes this the perfect solution for new-build and social housing.
Smart

Intelligent heat pump controls

The Passiv Smart Thermostat works seamlessly with Kensa heat pumps to fine‑tune performance in real-time. With out‑the‑box compatibility and intelligent tariff optimisation, it helps lower heating costs while keeping comfort consistent year‑round.

  • Hot water, heating & cooling

    Keeping homes cosy and warm in winter, then cool and comfortable in summer.

  • Easy to install & low maintenance

    Connect & Notify approval ensures easy electrical connection, with a 25+ year life expectancy and minimal maintenance.

  • Cost efficient

    Low cost for tenants, homeowners and housebuilders.
Installation

The Shoebox NX is Connect & Notify-approved on the Energy Network Association’s (ENA) heat pump database, saving consumers time and money.

Option 1

Slinkies

Buried in trenches at depths of 1.2m, slinky pipes (also known as slinkies) and straight pipes are a common form of ground array.
Option 2

Borehole

Ground source heat pump boreholes are vertical ground arrays or collectors used to extract heat energy from rock to a ground source heat pump.
Option 3

Pond Mats

Kensa pond mats are specifically designed to ease installation while maximising the energy absorbed from the water.
Models & Costs

Shoebox NX Heat Pump Costs

The Shoebox NX is a game-changing ground source heat pump that will kickstart the biggest transformation in home heating since the conversion to gas 50 years ago.
Single Phase
3kW
from £5,295
5kW
from £6,745

Zero Rated VAT

You could be eligible for a 0% VAT rate for domestic purchases of heat pumps. 0% VAT is available to homeowners until 31st March 2027.
Case studies

What our customers say...

Kensa’s new Shoebox NX ground source heat pump is supporting this self-builder’s goal of living more sustainably. 
View case study
Technical

Shoebox NX Technical Specifications

Dimensions
Downloads

Technical Downloads

  • Information Sheet

Actual Thermal Outputs (TIS)

0.28mb
  • Manual

Shoebox NX Installation Manual

6.59mb
  • Owner Document

UK Declaration of Conformity Shoebox NX

0.42mb
  • Manual

Shoebox NX Operational Manual

2.31mb
  • Information Sheet

Shoebox NX (TIS)

0.16mb
  • Information Sheet

External Immersion Contactor (TIS)

0.16mb
  • Information Sheet

Shoebox NX Revit File

10.44mb
Specs

Phase

5kW

3kW

Shoebox NX technical data

Nominal thermal kW rating
5.8
2.85
Part Number
S5-P0K-NX
S3NX-P0K
MCS Approved
BBA 0055/45
BBA 0055/46
Performance data - rated heating output at B0/W35 BS EN14511
Power consumption (kW)
1.35
0.65
Co-efficient of Performance (COP)*
4.36
4.40
Immersion heater output Kensa heat pumps do not feature back-up electric immersion heaters**
ENA Connect & Notify approval
Yes
Yes
Brine (primary) based on 0°C in / -4°C out
Design flow rate l/min
16.3
7.9
Pressure drop (kPa) at design flow rate
20
5.9
Max inlet temperature °C
25
15
Min temperature °C (outlet)
-5 (at standard settings)
-5 (at standard settings)
Heating water (secondary) based on 30°C in / 35°C out
Design flow rate (l/min)
17.0
7.9
Pressure drop (kPa) at design flow rate
10.2
2.8
Max flow temperature °C***
64
65
Electrical values at B0/W35
Rated voltage (V)
220-240 v / 50 Hz
220-240/ 50 Hz
Power supply rating (amps)
16
16
Rated current (max) amps
11.6
5.13
Typical running current at B0/W35 (amps)
6.6
3.2
Starting current (amps)****
12.2
23.7
Refrigerant circuit
Process medium
R407C
R134A
Fill volume kg
1.1
0.725
Compressor type
Scroll
Scroll
Dimensions
H X W X L (mm)
627 (H) X 554 (W) X 570 (D)
627 (H) X 554 (W) X 570
Dry weight kg
93
86
Operating pressure
Brine circuit min (primary) bar g
Configured at commissioning
Configured at commissioning
Heating water circuit min (secondary) bar g
Configured at commissioning
Configured at commissioning
Low pressure reset bar g
Configured at commissioning
Configured at commissioning
Connection sizes
Primary IN and OUT
3/4" BSP Parallel with 22mm
3/4" BSP Parallel with 22mm
Heating flow and return
3/4" BSP Parallel with 22mm
3/4" BSP Parallel with 22mm
Performance (based on Average Climate)
at 35°C
at 35°C
ErP rating
A+++
A++
SCOP*****
4.60
4.53
Seasonal space heating energy efficiency
176%
173.2%
Performance (based on Average Climate) at 55°C
ErP rating
A++
A++
SCOP*****
3.65
3.47
Seasonal space heating energy efficiency
138%
130.7%
Sound Power Level
Sound Power Level (dB)
51.2dBA
40.5dBA
* The COP figure quoted is calculated as per EN14511. ** In-built immersion heaters will increase running costs and CO2 emissions as they use direct electricity; because of this Kensa heat pumps do not include them. *** By increasing the flow temperature from the heat pump, the unit’s efficiency will drop, and the COP will decrease. ****Kensa Shoebox heat pumps incorporate smart starts as standard to limit the starting current of the compressors. For full details on how the starting currents are calculated, please contact Kensa. *****The SCOP figure quoted is calculated as per EN14825. Note: Design flow rates are for a ground temperature of 0°C and –4°C and a load temperature of 30°C and 35°C.