Trent & Dove, Phase One

Ground Source Review: Trent & Dove - Residents (The Carters) and staff

Ground Source Review: Trent & Dove Housing.

Trent & Dove Housing helped 133 tenants out of fuel poverty by replacing their night storage heating with ground source heating, all within just 3 months!

Discover how Trent & Dove Housing’s pioneering project reduces tenant fuel bills & generates a long term income to cover its costs.

  • Winner: District Heating Project of the Year (H&V News Awards 2017)
  • Winner: Best Client (National Housing & Maintenance Forum 2016)
  • Winner: Community Heating Project of the Year (Heating & Renewables Awards 2015)
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Ground Source Review: Trent & Dove Housing

In Spring 2015, Trent & Dove Housing and Kensa Heat Pumps delivered the UKs most ambitious retrofit upgrades programme of its time, replacing electric night storage heating with Kensa ground source heat pumps connected to shared ground loop arrays over 133 one and two bedroom bungalows over 15 different sites throughout Burton-upon-Trent.

As a result of the success of this project, Trent & Dove subsequently embarked on a second phase of heating system upgrades to ensure more of their tenants benefited from this reliable renewable technology.


Watch the video case study:


The success of this project has led to a successful combined campaign led by Trent & Dove Housing and Kensa to encourage other social housing providers to follow Trent & Dove’s example using their project as a blueprint.

Completed over a three month period, the Trent & Dove scheme features clusters of shared ground loop arrays over fifteen sites, feeding heating and hot water into pairs of bungalows, enabling upfront capital support via the Energy Company Obligation (ECO) subsidy alongside twenty years of Non Domestic Renewable Heat Incentive (RHI – this scheme has closed) income.

Each bungalow received a 6kW Kensa Shoebox heat pump and new hot water cylinder and radiators in place of its previous night storage heating.

Steve Grocock, Director of Property Service at Trent & Dove Housing comments:

We have calculated there are around 200,000 bungalows in the country that match the profile of those which we have just upgraded to ground source heat pumps; these are homes that are off the gas network, electrically heated, and in fuel poverty – or very close to it.

We have seen an immediate saving on tenants energy bills – many of whom are elderly and vulnerable – as a result of our upgrades programme, which we see as being key to reducing fuel poverty and excess winter deaths in our stock; the fact that 30,000 deaths nationwide every winter are deemed ‘preventable’ (according to the Office of National Statistics) is just unacceptable. Small measures such as replacing night storage heaters with more efficient and affordable ground source heat pump systems can make a big difference – in fact, in some cases, it is the difference. We should all be doing this – what are you waiting for?

Costs & Income

The retrofit project required an investment of £1.8m, which will be recouped via a £2.3m income through the ECO and RHI*. Trent & Dove’s initial investment was subsidised by the upfront ECO grant, and will be further off-set by the 20 years of income to be generated via the Non Domestic RHI*, thanks to the schemes innovative micro heat network qualifying as a district heating system. The expected payback is 15 years, with Trent & Dove continuing to receive Non Domestic RHI* payments as additional income for the remainder of the 20 year RHI* scheme.

Steve Grocock continues:

Until now, many housing providers have struggled to finance the upfront capital costs associated with ground source heat pumps, even though the maintenance costs and, of course, tenant’s energy bills are significantly reduced. However, Kensa Heat Pumps was able to unlock a combination of funding from the RHI* and ECO that made the financial case for the project stack up.

With the support of our contractors and Kensa Heat Pumps, Trent & Dove has achieved an outcome that many housing associations dream of; halved tenant energy bills, halved CO2 emissions in our stock, improved tenant health and well-being, and £2.3m of income through the RHI* to off-set our £1.8m investment – and all of this in just 3 months.

*RHI: this scheme has closed


Shared ground loop arrays

With no need for a plant room, Kensa’s solution overcomes the drawbacks of traditional “central plant” district heating systems as efficiency is not compromised by heat loss in the distribution pipework; and there is no need to meter and apportion energy bills between dwellings, thus avoiding the need to comply with recent regulations in this area (Heat Network (metering & billing) Regulations 2014).


The product

A 6kW Kensa Shoebox Twin was retrofitted into airing cupboards within each property. Measuring just 56cm H x 60.5cm W x 56.5cm L, the compact Sheobox quietly delivers heating and hot water to the property all year round. Fed by the shared ground loop array between a pair of properties, the Kensa Shoebox distributes hot water via a new hot water and radiator system, fitted in place of the old night storage heaters. Each system has been fitted with easy to use Honeywell programmers and thermostat controllers.


The tenants

Mrs Ball has lived in her house for 9 years. Due to medication, she suffers from the cold.

vlcsnap-2015-05-21-14h30m48s220The old night storage heaters were difficult to control – you couldn’t get the heat when you wanted it.

The installation was brilliant, 100%. I’ve never seen such good, clean workers. They did three houses in a week – brilliant, that’s work!


Mr Rowe has lived in his home for 4 years. He suffers from motor neurone disease, and as a consequence struggles with controls and mobility.

Mr Rowe 1I struggled with the dials on the night storage heaters, plus I like something when you can change your heating as and when you need it; so I started to use electric fan heaters instead, which wasn’t cost effective. The ground source heat pump has made a mega difference – an absolutely amazing difference.

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. Everybody I’ve spoken with has been terrifically pleased with it.

I didn’t think it would be as good as it is, but it’s absolutely amazing. I’d recommend it to anybody.


Mr and Mrs Carter have lived in their home for 11 years.

Mrs Carter 1The storage heaters were fine up to a point, but come 6pm in the winter months we had to use an electric fire, which meant we had some quite big electric bills. The letter saying we were going to have a ground source heat pump came just prior to Christmas – and it was the best Christmas present we had that year! It was brilliant – I immediately rang to say thank you!

We were amazed how quickly they took the old storage heaters out – they arrived at 8am and by 8:30am they were all gone! They were really fantastic workers. We’ve never had builders in the house that have followed themselves around with a vacuum!

There is no comparison to this system and the night storage heaters – this is 1000 times better. It is absolutely wonderful. The house actually feels cleaner. The temperature is terrific. You can control it. It’s brilliant, absolutely brilliant. I’m sure it’s knocked years off my age!


Further information:

Unlock the secrets of Trent & Dove Housing and Kensa’s Retrofit Scheme with these handy tools:

Video: Click here

  • Watch the project unfold with commentary from Steve Grocock and Trent & Dove Housing tenants

Case Study: Click here

  • Download the case study as a pdf

Project Overview & Event Guide: Click here

  • Follow Trent & Dove’s project step-by-step

Phase Two: Click here

  • Find out more about Trent & Dove’s second award-winning phase of retrofit ground source heat pump works, this time involving 60 flats


Key Facts

  • £1.8m investment
  • £2.3m ECO and RHI income (this scheme has closed) for 20 years
  • ECO subsidy supported
  • Non Domestic RHI supported (this scheme has closed)
  • Micro ground source heat network
  • Displacing electric night storage heating
  • Retrofit individual Kensa 6kW Shoebox heat pumps
  • New wet system installed (radiator & hot water cylinder)
  • 133 bungalows across 15 different sites
  • Three month schedule
  • Tenant fuel savings of £350-£500 per annum
  • Winner: Best Client (National Housing & Maintenance Forum 2016)
  • Winner: Community Heating Project of the Year (Heating & Renewables Awards 2015)
  • Shortlisted: Residential Retrofit Project of the Year (Heating & Renewables Awards 2015)
  • Shortlisted: Ground Source Heat Pump Retrofit Scheme (Buildings & Energy Efficiency Awards 2015)
  • Shortlisted: Sustainable Project of the Year (HVR Awards 2015)
  • Shortlisted: Installation of the Year - Domestic Ground Source (National ACR & Heat Pump Awards 2015)
  • Shortlisted: Social Impact Technology of the Year (Business Green Technology Awards 2015)

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