Overview

Key advantages of the Kensa Shoebox

Small & compact system

Heat the smallest of properties with a system that fits inside the airing cupboard or kitchen cabinet.

Safe heating for flats

Using a non-flammable refrigerant, the Shoebox comes without the risks, servicing and expenses of fossil fuel systems.

Compatible with district heating schemes

As part of a low-carbon network, a Shoebox per dwelling allows for independent heating and billing.

Provides cooling

Enjoy a cooler home in the hotter months using the system’s passive cooling mode.

Quiet & discreet

Tuck the Shoebox away inside without disruption. Enjoy peace and quiet with noise levels that equate to a fridge freezer.

Easy electrical connection

The Shoebox’s Connect & Notify approval saves any installation delay with network operators.

Rewarding payback

District Shoebox schemes can be rewarded via the government’s Non-Domestic Renewable Heat Incentive (RHI).

Small but mighty

Packing plenty of low-carbon benefits in a tiny package, the 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 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.

"This is the best heating I’ve ever seen – and the hot water is even better still. I’d recommend it to anybody, and it’s not just me talking – I speak to neighbours and they’ve all said it is fabulous."

Tenant - Trent & Dove Housing

Low-cost, low-maintenance heating & hot water

Rewarding returns & lifetime support

Alongside rewarding RHI returns, the Shoebox has low running costs, lack of annual servicing requirements and minimal maintenance over its 20-year design life.

On top of a 5-year guarantee, every Kensa heat pump comes with technical support for life.

See costs & payback

Greater returns for large-scale projects

When installed as part of a district heating scheme, Shoeboxes create an impressive 20-year income from the Non-Domestic RHI.

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.

See the district heating possibilities

Revolutionises heating in flats

The 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.

To form low-carbon district heating networks, Shoebox heat pumps can be paired with Shared Ground Loop Arrays and installed inside each dwelling for independent heating and hot water. This sustainable network 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

"This is a win-win situation. Not only do our residents benefit from significantly reduced bills, more controllable heating and improved health and well-being, CO2 emissions are halved".

Leon Storer - Stonewater Housing

Simple to install & commission

Connect & Notify approved

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. Not only does this avoid delay versus non-approved heat pump installations, but ultimately quickens the RHI process too.

See more technical features

Kensa’s installation services

Installing 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.

"This is an eco-friendly system that has enabled residents to save between £450-700 a year in heating costs at a time when household budgets are being squeezed."

Enfield Council

See more reviews

Looking for costs?
See heat pump prices & project examples.

Complimentary technical support

Shoebox 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 you

The Shoebox in action

In 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 study

Looking for technical specifications?
Discover features & technical data.

Models & Costs

Shoebox heat pump costs

Single-phase unit

3kW from £3,510

6kW from £4,700

 

*List prices exclude VAT.

Submit your plans for a quote

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.

Get a quote

Project cost example: 85 new-builds

Type of system 50 x 3kW & 35 x 6kW Shoebox heat pumps Vs. Gas combi boiler
Type of ground arrayShared Ground Loop Array of boreholes1-
Land area requiredAverage of 18sq/m per property-
Appliance & infrastructure cost*£606,960£323,000
Non-Domestic RHI income (over 20 years)**£962,582Not eligible
Running cost savings vs. gas (over 20 years)*** £31,509-
Servicing costs per property (over 20 years)****£2,000£2,000
Total net cost (after 20 years)*****£353,622 profit £325,000 cost

Lifetime & carbon savings

Type of system 50 x 3kW & 35 x 6kW Shoebox heat pumps Vs. Gas combi boiler
Type of ground arrayShared Ground Loop Array of boreholes1-
Land area requiredAverage of 18sq/m per property-
Appliance & infrastructure cost*£606,960£323,000
Non-Domestic RHI income (over 20 years)**£962,582Not eligible
Running cost savings vs. gas (over 20 years)*** £31,509-
Servicing costs per property (over 20 years)****£2,000£2,000
Total net cost (after 20 years)*****£355,622 profit £323,000 cost
Lifetime expectancy: Appliance Up to 20 yearsUp to 10 years
Lifetime expectancy: InfrastructureUp to 100 yearsUp to 100 years
Carbon saved vs. gas (over 20 years)******1,129 tonnes-
Local NOx emissions saved vs. gas*******18.2 kgNOx/y-


Project cost example: Retrofit installations in 60 flats

Type of system30 x 3kW Shoebox & 30 x 6kW Shoebox heat pumps
Vs. Electric night storage heater
Type of ground arrayShared Ground Loop Array of boreholes1-
Land area requiredAverage of 18sq/m per property-
Appliance, infrastructure & project management cost^£698,500 £189,000
Non-Domestic RHI income (over 20 years)*£931,134 Not eligible
ECO funding £53,805 Not eligible
Running cost savings vs. electric NSH (over 20 years)**£484,045 -
Servicing costs per property (over 20 years)***£2,000£2,000
Total net cost (after 20 years)****£284,439 profit£191,000 cost

Lifetime & carbon savings

Type of system 30 x 3kW & 30 x 6kW Shoebox heat pumps Vs. Electric night storage heater (NSH)
Type of ground array Shared Ground Loop Array of boreholes -
Lifetime expectancy: Appliance Up to 20 yearsUp to 10 years
Lifetime expectancy: InfrastructureUp to 100 years-
Carbon saved
vs. NSH (over 20 years)*****
5,381 tonnes -
Local NOx emissions saved******19.6 kgNOx/y 19.6 kgNOx/y

Planning? Still researching?

Wherever you are, we can help.

Technical

Performance features

Hot 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.

Installation features

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.


Warranties

Shoebox components


Core heat pump unit (refrigeration components)


Controller & water pumps

Warranty


5 years


2 years


Accreditation & awards

Connect & Notify approval

Connect & Notify approval from the Energy Networks Association (ENA) can save time and money.

MCS accreditation

Certified by the Microgeneration Certification Scheme (MCS), ensuring compliance and supporting the application for the RHI.

A+ energy efficiency

A+ Energy-related Product (ErP) rating.

ISO9001 approval

Manufactured in an ISO9001 accredited facility.

Product Innovation of the Year

Winner at the National Heat Pump Awards 2013.

Business Innovation of the Year

Winner at the South West Green Energy Awards 2013.


Dimensions

3 kW Shoebox

515mm high

480mm wide

360mm deep

6 kW Shoebox

585mm high

610mm wide

595mm deep

 


Shoebox series technical data

PhaseSingleSingle
Nominal thermal kW rating3.06.0
Part NumberS3-P0KS6-P0K
MCS ApprovedBBA0055/31BBA0055/35
Performance data - rated heating output at B0/W35 BS EN14511
Power consumption0.8kW1.6kW
Co-efficient of Performance*4.053.84
Immersion heater outputKensa heat pumps do not feature back-up electric immersion heaters**
ENA Connect & Notify approvalYesYes
Brine (primary) based on 0°C in / -4°C out
Design flow rate kg/min9.218.4
Pressure drop kPa at design flow rate516
Max inlet temperature °C25
Min temperature °C (outlet)-5 (at standard settings)
Heating water (secondary) based on 30°C in / 35°C out
Design flow rate l/min8.6216.88
Pressure drop kPa at design flow rate1.00.64
Max flow temperature °C***65 (RHI applications 64C)65 (RHI applications 60C)
Electrical values at B0/W35
Rated voltage220-240 v / 50-60 Hz
Power supply rating amps1325
Rated current (max) amps714
Typical running current at B0/W35 amps48
Starting current amps****3034
Refrigerant circuit
Process mediumR134a
Fill volume kg0.71.6
Compressor typeReciprocal
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 kg60100
Operating pressure
Brine circuit min (primary) bar g0.3
Heating water circuit min (secondary) bar g0.6
Low pressure reset bar g1.8
Connection sizes
Primary IN and OUTValves and anti-vibration leading to 22mm
Heating flow and returnValves and anti-vibration leading to 22mm
Performance (based on Average Climate) at 35°C
ErP ratingA+A+
SCOP*****3.683.45
Seasonal space heating energy efficiency139%130%
Performance (based on Average Climate) at 55°C
ErP ratingA+A+
SCOP*****2.992.97
Seasonal space heating energy efficiency112%111%
Sound Power Level
Sound Power Level (dB)47dBA52dBA
* 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 efficiency of the unit will drop and the COP decreases.
****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.

Get the MCS stamp of approval

with Kensa’s MCS Umbrella Service.

Dedicated technical support

“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”

Reviews

Case study reviews

Shoebox Ground Source Heat Pump

"This is an eco-friendly system that has enabled residents to save between £450-700 a year in heating costs at a time when household budgets are being squeezed."

Enfield Council

See case study

Project overview

Over 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

Non-Domestic RHI eligible

Kensa Contracting managed scheme


Shoebox Ground Source Heat Pump

"The new heating system is amazing, before it was so difficult to heat up more than one room in my home but now I don’t have to worry about that."

Tenant, Together Housing project

See case study

Project overview

770 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

Non-Domestic RHI eligible

Kensa Contracting managed scheme


Shoebox Ground Source Heat Pump

"Tenant satisfaction with the heat pump solution has been high and the support and assistance we have received from Kensa has been first class. Tenants with the benefit of Kensa’s ground-source heat pumps tell us how warm their homes are and how affordable the system is."

Ian Richardson, Shropshire Rural Housing Association

See case study

Project overview

8 new-build properties

6 kW Shoebox heat pumps

Shared Ground Loop Array system

Non-Domestic RHI eligible

Kensa Contracting managed scheme


Shoebox Ground Source Heat Pump

"This is a win-win situation. Not only do our residents benefit from significantly reduced bills, more controllable heating and improved health and well-being, CO2 emissions are halved".

Leon Storer, Stonewater Housing

See case study

Project overview

49 off-gas bungalows

Displacing night storage heaters

Shared Ground Loop Array system

ECO eligible

Non-Domestic RHI eligible

Kensa Contracting managed scheme


Shoebox Ground Source Heat Pump

"The Shoebox heat pump from Kensa provides the perfect sustainable heating solution. Not only is it compact and quiet, but being able to warm the boat using the very water that it is sailing on is remarkable."

Artie Chalmers, boat builder

See case study

Project overview

Environmentally-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


Shoebox Ground Source Heat Pump

"This is the best heating I’ve ever seen – and the hot water is even better still. I’d recommend it to anybody, and it’s not just me talking – I speak to neighbours and they’ve all said it is fabulous."

Tenant, Trent & Dove Housing

See case study

133 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 and RHI income for 20 years

Tenant fuel savings of £350-£500 per annum

Kensa Contracting managed scheme


Kensa Google reviews

Allan T.
Allan T.
14:21 10 Nov 20
We installed our heat pump in 2007, yes..13 years ago. It has been an excellent and reliable... investment that has performed exactly as planned. Support from Kensa can only be described as outstanding. Any call for support is quickly answered by knowledgeable engineers, who work with you to diagnose and resolve the fault or diagnose the issue and then send the right resources to fix the system. They clearly keep a sense of ownership and pride in what they make and install and are patience personified in the way they deal with lay customers. Top marks from me and thanks in particular to Tom with a recent sensor failure that proved difficult to identify.read more
Nigel D.
Nigel D.
18:16 09 Nov 20
I am delighted with the service provided by Kensa. I purchased a ground source heat pump from this... company in 2014 and I have been very pleased with my purchase. When help is required the very able technical team are always accessible and very willing to assist. I am very happy to recommend this company to anyone considering to invest in a ground source heat pump.read more
Steve A.
Steve A.
13:44 13 Oct 20
We have a Kensa GSHP, the pump is reliable, needs little servicing and is both environmentally and... uses only a little electricity. Todd in tech support is THE most helpful and informed person you will come accross...what's not to like?read more
John G.
John G.
15:10 06 Oct 20
We recently had a Kensa Heat Pump installed at our new build Hobbit Hole holiday let. Nothing about... this whole build was easy but we opted for Kensa for our renewable energy. Brilliant decision from the start, the product layout, working with our staggered delivery requests due to a just in time scheme adopted for the build, to literally holding our hand during the self installation process using a heat engineer locally. So helpful, and great to know if we need further guidence, totally confident they are there. John & Rebecca Garrett, Hobbit Hole, Abbotsham,North Devonread more
Michael P.
Michael P.
12:59 06 Oct 20
Can’t thank these guys enough especially Todd his knowledge of these heat pumps is second to none
Martin B.
Martin B.
21:43 02 Oct 20
I had a Kensa heat pump installed in 2017. It has worked really well and saved significantly on... space and water heating costs. The technical support team at Kensa have been absolutely fantastic helping sort out installation issues, responding very quickly and positively to queries and resolving issues very efficiently.read more
Richard J.
Richard J.
07:33 17 Sep 20
great service, very efficient as always
Bharat R.
Bharat R.
19:53 23 Aug 20
I chose Kensa Heat Pumps for our GSHP needs because Steve Costello and the other professionals I... met at home building events always welcomed me and answered all my questions. They introduced me to Howard Smith Builders in Herefordshire who installs many of their pumps and I visited him to see first-hand an installation Howard had done. Back to Kensa. All throughout the build and spec of our pump, Kensa stayed in touch and Steve even visited our home when the work began. I have also been assured that as and when there are software updates for their pumps, Kensa will provide them to me to ensure my pump stays at the optimum level. Thank you, Steve, and Kensa for sticking with me when I needed you to hold my pump for a year with no extra charge! Looking forward to having Lewington’s of Market Harborough finishing the install of your pump and slinkies this Wednesday!read more
Joule E.
Joule E.
17:17 22 Jul 20
I have been using Kensa for a number of years now, and whilst the service is always exceptional... from every member off the team, just recently, and during these trying times, Jacquelyn, James & Maggie have gone the extra mile to ensure my business has kept installing. Really fantastic work guys, much appreciated, thank you, Lee Whiteread more
Mike H.
Mike H.
12:25 08 May 20
Well, Kensa technicians continue to do a wonderful job. We installed our heat pump back in 2007.... Paid a fair price, got a grant towards the cost and have benefited from cheaper heating ever since. Any other boiler I am sure would have been on the scrap heap by now and the manufacturers not in the slightest bit interested in us. But not Kensa, they have continued to give first class technical support throughout the thirteen years - all advice free, friendly and helpful. We’ve bought a few bits, but not many and several parts have been provided free of charge. This time it was Todd doing the magic programming a new Corel for us, which he sent us by return at absolutely no cost to us. So anyone reading this - thinking of having a Kensa heat pump - do it! You won’t be sorry. Todd likened it to a land rover - sturdy, robust, efficient and long lasting and I think that’s absolutely right.read more
Steve T.
Steve T.
14:47 04 May 20
Can't recommend Kensa enough. Great product, phenomenal customer service. I called them after our... heat pump stopped working and spoke to an engineer called Tod. He was extremely knowledgeable and talked me through getting it going again over the telephone, even though turned out that the fault wasn't anything to do with the heat pump itself! Above and beyond, even messaged me again to check everything was still ok. Thanks Tod, you are an asset to Kensa!!read more
Duncan R.
Duncan R.
17:11 27 Apr 20
Great company to work with. Very professional in every aspect of their business. The best company... to deal with if want a heat pump system that is designed and installed by highly skilled and experienced people.read more
Jon T.
Jon T.
20:44 12 Mar 20
The staff at Kensa could not have been more helpfulI bought a 10 kw heat pump in 2007 which has... worked without a problem untill while extending my drains I cut through one of the underground pipes. The help I received enabled me to get my system up and running with only a day down time very very helpful.read more
Jean C.
Jean C.
20:07 03 Mar 20
We found all Kensa personnel helpful and knowledgeable, especially TomWorth, when our heat... exchanger broke down. Very pleased we purchased Kensa. Peter Lyonsread more
Robert E.
Robert E.
10:39 20 Feb 20
Similar to another reviewer, we bought Ground Source Heat Pump from Kensa some 10 or more years... ago. Never had any problems what so ever, until recently it fails to start and only rarely does it get up and going.Called the service desk, spoke to one of the Tom's, excellent knowledgeable advice culminating in us purchasing a replacement smart start box. I was nervous about doing the replacement, but encouraged by Tom, gave it a shot, it worked perfectly, job done !A couple of calls to the team always results in friendly expert definitive advice, everything breaks at some point, so its all in the recovery and the support team at Kensa have made recovery and service into an art form.The product is by design inherently more reliable than oil or gas boilers and the Kensa support experience confirms it was the right decision to buy the product.Congratulations.read more
Mark N.
Mark N.
20:39 15 Jan 20
Came across the invoice for our Kensa heat pump during a clear out. It cost us about £6k just over... ten years ago (+ digger hire for a few days) and I reckon it's saved us at least £750 per year since (probably closer to £1000). Maintenance cost so far has just been inhibitor for the heating system.read more
David W.
David W.
21:44 05 Dec 19
First class product and excellent after sales attention - even when out of guarantee
Derek S.
Derek S.
09:44 01 Dec 19
I bought a 10 year old house with a Kensa Ground Source Heat Pump last year. Recently, my hot... water has not been as hot as usual so I contacted Kensa for some advice. Bear in mind this is a 10 year old heat pump, well out of warranty . . . They could not have been more helpful!I have spent at least a couple of hours on the phone with Todd from their technical support team. He helped me troubleshoot, talked me through how to open the unit up and check things myself. He sent me some small parts free of charge and I also bought a couple of replacement parts, which he again talked me through how to fit.I have never come across a single company in my entire life that wouldn't charge me for this time. I'm well out of warranty and yet Todd did not hesitate to help. No bill for labour, just patient, friendly advice. What amazing service! Second to none!If I ever need another heat pump I'll be going straight to Kensa. Best customer service I've ever experienced!read more
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