Replacing gas boilers in UK high-rise tower blocks
When faced with the dilemma of how to completely remove the gas supply and replace old combi boilers without decanting residents from 364 apartments in seven tower blocks in northern England, housing association Gentoo Group turned to energy services supplier ENGIE for advice.
To complicate matters, any new system would have to be easy to use and fit into the limited space available in each home. This ruled out installing traditional hot-water systems and the associated pipework. Unvented cylinders were impractical to fit because of the nature of the building.
Some of the homes benefiting from Sunamp’s heat batteries. Part of Gentoo Group’s ‘Core 364’ gas replacement programme in Sunderland.
A space-saving Sunamp heat battery in one of Gentoo Group’s homes. It is more compact than traditional hot water cylinders.
The answer was an integrated system combining Sunamp’s super compact heat batteries for hot water and Kensa Contracting’s small and quiet Shoebox ground source heat pumps, controlled by a smart, easy-to-use interface from Switchee.
This fully integrated system is fed communally but managed locally, providing residents with greater individual levels of control and comfort, and lower running costs.
As a result, building safety improved as there is no longer any potential risk of a gas-related explosion, and the risk of carbon monoxide poisoning and disease infection from legionella is eliminated.
Maintenance costs are considerably reduced as there is no longer any need for annual gas safety tests and certification, nor cylinder safety checks.
Carbon emissions will be reduced by an estimated 420 tonnes, or nearly 70% per year.
The Sunamp / Kensa partnership solution has enabled gas supplies to be removed for the first time from occupied high-rise buildings in the UK, with minimum disruption. The same system can equally be applied elsewhere and bring the same advantages to lower density housing.
The technical details
- Carbon savings: approximately 420t/year (-70%)
- Heating capacity: 308 x 3kW + 56 x 6kW (1.26MW)
- Storage capacity: 364 x 9kWh (3.28MWh)
- Heating source: individual heat pumps (Kensa Shoebox) and heat batteries (Sunamp UniQ) connected to an open-loop ground-source system
- Heat pump supply temperature: space heating up to 55°C and heat battery charging up to 65°C
- FullyCharged Home Series episode video featuring the Core 364 project
- Housing association Gentoo Group
- Gentoo’s instruction video for residents about using their heating system featuring the Sunamp heat battery
- Heat pump supplier Kensa
- Internet-connected thermostat provider Switchee
- Sunamp’s blog ‘Revolutionary approach to gas removal in high-rise homes is catching on fast with social landlords’