# Vaillant Heat Pump and Battery Installer Morden SM4 | GEH > A Vaillant air source heat pump in place of a gas boiler in Morden SM4, with a hot water cylinder inside and a Fox ESS battery and hybrid inverter. *Green Electro Heating — https://electro-heating.co.uk/vaillant-heat-pump-installer-morden-sm4/. Verbatim from the page; this is the same content, not a summary.* --- # Vaillant Heat Pump and Battery Installation, Morden SM4 Between 29 October and 4 November 2026 our engineers replaced the gas boiler at a house in Morden, SM4, with a Vaillant air source heat pump, and fitted a Fox ESS home battery on the same wall outside. - ReplacedGas boiler - Postcode areaSM4 [Book a free survey](https://electro-heating.co.uk/heat-pump-assessment-form/) [WhatsApp us](https://wa.me/447875564437?text=Hi%20Green%20Electro%20Heating%2C%20I%20have%20seen%20your%20Morden%20SM4%20project%20and%20would%20like%20a%20price%20for%20a%20heat%20pump.%20My%20postcode%20is%20) 020 3837 0778 [**5.0** 43 Google reviews](https://maps.google.com/?cid=11799548311081227482) [**4.8** 50 Trustpilot reviews](https://uk.trustpilot.com/review/electro-heating.co.uk) [![Morden SM4, installed by Green Electro Heating](https://electro-heating.co.uk/assets/img/projects/morden-sm4-heatpump-1260.webp)](https://electro-heating.co.uk/assets/img/projects/morden-sm4-heatpump-1260.webp) ## The boiler cupboard now holds the hot water The house had a Vaillant gas boiler in a cupboard off the living space. The boiler came out, and a hot water cylinder now stands in the same cupboard, piped in copper with its expansion vessels, so nothing new had to find room inside the house. The Vaillant controls sit in the cupboard below the cylinder, where an engineer can reach them at the yearly service without moving anything else. ## One tidy wall outside The heat pump is a two-fan Vaillant monobloc. It stands on anti-vibration feet on a concrete base at the side of the house, with the pipework run low along the foot of the wall. Beside it are three rotary isolators, then the Fox ESS H1 5 kW hybrid storage inverter on the wall and the Fox ESS CQ7 battery on its own slab below it. The battery uses lithium iron phosphate cells, and every cable between the inverter, the battery and the house runs in black conduit. ## New electrics for the new load A heat pump and a battery change what the house asks of its supply, so we made up a new consumer unit for the house as part of the job. More of our heat pump work nearby: [Air source heat pump installation Wimbledon](https://electro-heating.co.uk/heat-pump-installer-wimbledon-london/). ## The job in short Installation summary**Morden SM4** MCS certified NIC-601634 Postcode area SM4 Completed November 2026 Installed by Our own engineers ### The installation Heat pump Vaillant air source, two-fan monobloc Replaced Gas boiler Hot water Hot water cylinder in the old boiler cupboard Battery Fox ESS CQ7, lithium iron phosphate Inverter Fox ESS H1 5 kW hybrid storage inverter Electrics New consumer unit and outdoor isolators ### Included in the installation - Heat pump installation - Hot water cylinder installation - Boiler Upgrade Scheme grant application - Grant voucher redemption - Building Control certificate and DNO commissioning - MCS certification and paperwork - Warranty registration and insurance-backed warranty Boiler Upgrade Scheme grant**£7,500, applied for and redeemed by us** VAT**0%** Every job is priced from a free survey of the house. Your fixed written price comes after it, before any work starts. ## Photos from the job [![The finished wall: the Vaillant heat pump, three isolators, the Fox ESS inverter and the battery.](https://electro-heating.co.uk/assets/img/case/morden-sm4-01-960.webp)](https://electro-heating.co.uk/assets/img/case/morden-sm4-01-960.webp) [![The two-fan Vaillant unit on anti-vibration feet, set on a concrete base.](https://electro-heating.co.uk/assets/img/case/morden-sm4-02-960.webp)](https://electro-heating.co.uk/assets/img/case/morden-sm4-02-960.webp) [![The Fox ESS hybrid inverter on the wall above the battery, with its cables run in black conduit.](https://electro-heating.co.uk/assets/img/case/morden-sm4-03-960.webp)](https://electro-heating.co.uk/assets/img/case/morden-sm4-03-960.webp) [![The battery stands on its own slab, raised on feet off the ground.](https://electro-heating.co.uk/assets/img/case/morden-sm4-04-960.webp)](https://electro-heating.co.uk/assets/img/case/morden-sm4-04-960.webp) [![The rating plate of the Fox ESS H1 5 kW storage inverter.](https://electro-heating.co.uk/assets/img/case/morden-sm4-05-960.webp)](https://electro-heating.co.uk/assets/img/case/morden-sm4-05-960.webp) [![Before: the gas boiler in the cupboard, above the white cabinet.](https://electro-heating.co.uk/assets/img/case/morden-sm4-06-960.webp)](https://electro-heating.co.uk/assets/img/case/morden-sm4-06-960.webp) [![After: the hot water cylinder in the same cupboard, with the expansion vessels and the Vaillant controls below.](https://electro-heating.co.uk/assets/img/case/morden-sm4-07-960.webp)](https://electro-heating.co.uk/assets/img/case/morden-sm4-07-960.webp) [![The new consumer unit being made up before it went on the wall.](https://electro-heating.co.uk/assets/img/case/morden-sm4-08-960.webp)](https://electro-heating.co.uk/assets/img/case/morden-sm4-08-960.webp) [![Our engineer at the battery during the final checks, beside the Vaillant heat pump.](https://electro-heating.co.uk/assets/img/case/morden-sm4-09-960.webp)](https://electro-heating.co.uk/assets/img/case/morden-sm4-09-960.webp) ## Talk to us about a heat pump We survey the house, design the system and give you a fixed written price. No pressure to go ahead. - Free home survey and heat loss calculation - Fixed written price before any work starts - The £7,500 grant applied for by us - MCS certified, our own engineers [Book a free survey](https://electro-heating.co.uk/heat-pump-assessment-form/) [WhatsApp us](https://wa.me/447875564437?text=Hi%20Green%20Electro%20Heating%2C%20I%20have%20seen%20your%20Morden%20SM4%20project%20and%20would%20like%20a%20price%20for%20a%20heat%20pump.%20My%20postcode%20is%20) Or call 020 3837 0778 ## More of our installations [![Wimbledon SW19, installed by Green Electro Heating](https://electro-heating.co.uk/assets/wp/2025/04/Web-Into-Image-Size-2.webp) **Wimbledon SW19**See the project →](https://electro-heating.co.uk/heat-pump-installer-in-wimbledon-sw19/) [![Clapham SW4, installed by Green Electro Heating](https://electro-heating.co.uk/assets/jobs/vaillant-arotherm-heat-pump.webp) **Clapham SW4**See the project →](https://electro-heating.co.uk/heat-pump-installer-clapham-london-sw4/) [![Dulwich SE21, installed by Green Electro Heating](https://electro-heating.co.uk/assets/jobs/samsung-heat-pump-back-garden.webp) **Dulwich SE21**See the project →](https://electro-heating.co.uk/heat-pump-installer-dulwich-london-se21/) [View all projects](https://electro-heating.co.uk/our-projects/) ## Thinking about a heat pump in Morden or Merton? We survey the house, measure the heat loss room by room and send a fixed written price, with the £7,500 grant taken off where it applies. No cost and no obligation. [Book a free survey](https://electro-heating.co.uk/heat-pump-assessment-form/) Call 020 3837 0778