Heat the smallest of properties with a system that fits inside the airing cupboard or kitchen cabinet.
Using a non-flammable refrigerant, the Shoebox comes without the risks, servicing and expenses of fossil fuel systems.
As part of a Networked Heat Pump system, a Shoebox per dwelling allows for independent heating and billing.
Enjoy a cooler home in the hotter months using the system’s passive cooling mode.
Tuck the Shoebox away inside without disruption. Enjoy peace and quiet with noise levels that equate to a fridge freezer.
The Shoebox’s Connect & Notify approval saves any installation delay with network operators.
Depending on your project type, there is a range of funding options that we can advise you on. Visit this page to explore different types of funding.
Packing plenty of low-carbon benefits in a tiny package, the original Shoebox delivers heating and hot water to the smallest of properties. Fit it inside a cabinet, kitchen unit or airing cupboard – the minuscule Shoebox will make itself right at home.
The original Shoebox is powerful. Generating heat at the point of use, the system produces hot water temperatures up to 65°C. The Shoebox system can even be configured to deliver passive cooling when summer comes; a particularly useful add-on for high-rise buildings in district heating schemes.
Among many of the Shoebox’s remarkable features is its versatility. From social housing tower blocks and new-build developments to energy-efficient holiday lodges and barges, the Shoebox delivers heating, hot water and cooling to all kinds of small or Passivhaus projects. It uses a non-flammable refrigerant as a safe alternative to combustion fossil fuels and renewables with flammable refrigerant.
Engineered with comfort in mind, the series’ noise levels range from 47 to 52 decibels – comparable in sound to the average fridge freezer.
Tenant - Trent & Dove Housing
The Shoebox has low running costs, lack of annual servicing requirements and minimal maintenance over its 20-year design life.
With up to 5 years guarantee, every Kensa heat pump comes with technical support for life (terms and conditions apply).
When installed as part of a Networked Heat Pump scheme, Shoebox heat pumps connect households to a net-zero carbon future with a cost-effective, low-carbon approach.
All it takes is to connect two or more dwellings, each of which contains a Shoebox, via Kensa’s low-carbon network of Shared Ground Loop Arrays.
Networked Heat Pump possibilitiesThe electrically-powered Shoebox delivers heating and hot water to high-rise homes without the risk, pollution, carbon, servicing or maintenance you’d expect from gas and oil.
Perfect for social housing retrofits, the Shoebox helps tower blocks and flats achieve carbon reduction targets and compliance by improving efficiencies and emissions – all while tackling fuel poverty.
Shoebox heat pumps can be paired with Shared Ground Loop Arrays and installed inside each dwelling for independent heating and hot water to form Networked Heat Pump systems. This sustainable underground infrastructure lasts up to 100 years.
A Shoebox per household prevents traditional district heating problems such as overheating in high-rise buildings, subsequent heat and efficiency losses and shared heating bills. Instead, end users have the freedom to choose the energy tariff that suits them.
See the tower block transformation in ThurrockLeon Storer - Stonewater Housing
The Shoebox series is Connect & Notify-approved on the Energy Network Association’s (ENA) heat pump database, saving time and money for consumers. In most circumstances, approval also protects householders and housing associations from having to pay for an electricity upgrade.
For individual installations, approval almost always means installations can go ahead immediately; local District Network Operators (DNO) don’t have to be notified until after the installation. This avoids delay versus non-approved heat pump installations.
See more technical featuresInstalling the Shoebox couldn’t be easier with Kensa – simply choose from our range of services to suit you.
• Find a Kensa-approved installer to fit the Shoebox heat pump for you.
• Installers can use our MCS Umbrella scheme for an MCS-accredited installation below 45 kW.
• Large-scale installations can get support with anything from project management to tenant liaison from our delivery partner, Kensa Contracting.
Enfield Council
See more reviewsShoebox owners and installers have access to Kensa’s technical support for the system’s lifetime. This includes anything from design and commissioning guidance to post-installation advice.
See how we support youIn a project with Flagship Group in Suffolk, Shoebox heat pumps proudly take the place of inefficient storage heaters in twelve homes.
See Flagship's case study3kW from £4,450
6kW from £5,970
*Zero Rated VAT on Heat Pumps
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. Full details can be found here: https://www.gov.uk/guidance/vat-on-energy-saving-materials-and-heating-equipment-notice-7086.
The model specified for your project will depend on factors such as the building’s insulation levels and energy efficiency.
If you’d like an even better idea of project costs, tell us about your plans to get a quote.
Discover funding opportunities
Get a quoteHot water temperatures up to 65°C at the point of use.
Temperature setpoints, one for heating and one for domestic hot water, produce the required heat at the highest efficiency – without the need for costly direct immersion heaters.
Weather compensation fitted as standard to adjust the heat pump’s temperatures depending on the weather.
A fixed speed compressor compresses the ground’s low-grade heat and delivers real-time efficiencies, reliability and long product life.
In-built water pump for the ground side of the Shoebox unit.
22mm valved connections on top of the heat pump with flexible pipes.
Designed to be installed inside the home, typically a kitchen or airing cupboard.
Core heat pump unit (refrigeration components)
Controller & water pumps
5 years
2 years
Connect & Notify approval from the Energy Networks Association (ENA) can save time and money.
Certified by the Microgeneration Certification Scheme (MCS), ensuring compliance and supporting the application for funding streams.
A+ Energy-related Product (ErP) rating.
Manufactured in an ISO9001 accredited facility.
Winner at the National Heat Pump Awards 2013.
Winner at the South West Green Energy Awards 2013.
515mm high
480mm wide
360mm deep
585mm high
610mm wide
595mm deep
| Phase | Single | Single |
|---|---|---|
| Nominal thermal kW rating | 3.0 | 6.0 |
| Part Number | S3-P0K | S6-P0K |
| MCS Approved | BBA0055/31 | BBA0055/35 |
| Performance data - rated heating output at B0/W35 BS EN14511 | ||
| Power consumption | 0.8kW | 1.6kW |
| Co-efficient of Performance* | 4.05 | 3.84 |
| 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 kg/min | 9.2 | 18.4 |
| Pressure drop kPa at design flow rate | 5 | 16 |
| Max inlet temperature °C | 25 | |
| Min temperature °C (outlet) | -5 (at standard settings) | |
| Heating water (secondary) based on 30°C in / 35°C out | ||
| Design flow rate l/min | 8.62 | 16.88 |
| Pressure drop kPa at design flow rate | 1.0 | 0.64 |
| Max flow temperature °C*** | 65 | 65 |
| Electrical values at B0/W35 | ||
| Rated voltage | 220-240 v / 50-60 Hz | |
| Power supply rating amps | 13 | 25 |
| Rated current (max) amps | 7 | 14 |
| Typical running current at B0/W35 amps | 4 | 8 |
| Starting current amps**** | 30 | 34 |
| Refrigerant circuit | ||
| Process medium | R134a | |
| Fill volume kg | 0.7 | 1.6 |
| Compressor type | Reciprocal | |
| Dimensions | ||
| H X W X L (mm) | 515 (H) X 480 (W) X 360 (D) | 585 (H) X 610 (W) X 595 (D) |
| Dry weight kg | 60 | 100 |
| Operating pressure | ||
| Brine circuit min (primary) bar g | 0.3 | |
| Heating water circuit min (secondary) bar g | 0.6 | |
| Low pressure reset bar g | 1.8 | |
| Connection sizes | ||
| Primary IN and OUT | Valves and anti-vibration leading to 22mm | |
| Heating flow and return | Valves and anti-vibration leading to 22mm | |
| Performance (based on Average Climate) at 35°C |
||
| ErP rating | A+ | A+ |
| SCOP***** | 3.68 | 3.45 |
| Seasonal space heating energy efficiency | 139% | 130% |
| Performance (based on Average Climate) at 55°C |
||
| ErP rating | A+ | A+ |
| SCOP***** | 2.99 | 2.97 |
| Seasonal space heating energy efficiency | 112% | 111% |
| Sound Power Level | ||
| Sound Power Level (dB) | 47dBA | 52dBA |
“The support team at Kensa have made recovery and service into an art form.”
“First class product and excellent after sales attention – even when out of guarantee”
Enfield Council
See case studyOver 400 flats over 8 x 12 storey tower blocks
2019 District Heating Project of the Year (H&V News Awards)
Tenants bills are reducing from an average £800 per year to an average £350
Estimated 773t CO² saved
Kensa Contracting managed scheme
Tenant, Together Housing project
See case study770 Shoebox heat pumps in social housing properties
Displacing night storage heaters
Shared Ground Loop Array system
Borehole drilling of up to 200m
Up to 45% savings on running costs
Kensa Contracting managed scheme
Ian Richardson, Shropshire Rural Housing Association
See case study8 new-build properties
6 kW Shoebox heat pumps
Shared Ground Loop Array system
Kensa Contracting managed scheme
Leon Storer, Stonewater Housing
See case study49 off-gas bungalows
Displacing night storage heaters
Shared Ground Loop Array system
ECO eligible
Kensa Contracting managed scheme
Artie Chalmers, boat builder
See case studyEnvironmentally-friendly and sustainable canal barge
12ft wide x 65ft long, 3 bedrooms
3 kW Shoebox heat pump
Water being used as heat source
Zoned underfloor heating
Tenant, Trent & Dove Housing
See case study133 bungalows across 15 different sites
Retrofit individual Kensa 6kW Shoebox heat pumps
Shared Ground Loop Array system
Three-month schedule
£1.8m investment
£2.3m ECO
Tenant fuel savings of £350-£500 per annum
Kensa Contracting managed scheme
