# Vaillant Heat Pump, Mill Hill NW7 | Case Study

> An ageing gas boiler replaced with a Vaillant heat pump in Mill Hill NW7 in three days, with the £7,500 grant approved in 48 hours and two years of aftercare.

*Climate Shield London — https://climateshieldlondon.co.uk/projects/vaillant-heat-pump-mill-hill-nw7/. Verbatim from the page; this is the same content, not a summary.*

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![The aroTHERM plus on anti-vibration feet on a concrete pad close to the house.](https://climateshieldlondon.co.uk/assets/img/case/mill-hill-nw7-01-960.webp)

# From gas boiler to heat pump in three days in Mill Hill

An ageing gas boiler out and a Vaillant heat pump in, with the grant approved in two days and a two-year aftercare package behind it.

[Price my heat pump](https://climateshieldlondon.co.uk/heat-pump-cost-london/#calc-hp) [WhatsApp us](https://wa.me/447875564437?text=Hi%20Climate%20Shield%2C%20I%20have%20seen%20your%20Mill%20Hill%20NW7%20job%20and%20would%20like%20a%20survey.)

- Our own job, photographed on the day
- Free survey and a fixed written price
- MCS certified, NICEIC approved electrics

## Book a free survey

Three taps and your number. Free, and nothing to sign.

## Accredited, and fitting the brands you know

![NICEIC approved contractor](https://climateshieldlondon.co.uk/projects/assets/img/accreditations/niceic-mark.webp) ![Gas Safe Register](https://climateshieldlondon.co.uk/projects/assets/img/accreditations/gas-safe-mark.webp) ![MCS certified](https://climateshieldlondon.co.uk/projects/assets/img/accreditations/mcs-mark.webp) ![RECC, Renewable Energy Consumer Code](https://climateshieldlondon.co.uk/projects/assets/img/accreditations/recc-mark.webp) ![TrustMark, Government Endorsed Quality](https://climateshieldlondon.co.uk/projects/assets/img/accreditations/trustmark-mark.webp) ![Vaillant](https://climateshieldlondon.co.uk/projects/assets/img/brands/vaillant.573f9864.webp) ![Clivet](https://climateshieldlondon.co.uk/projects/assets/img/brands/clivet.15efbad2.webp) ![Samsung](https://climateshieldlondon.co.uk/projects/assets/img/brands/samsung.3b6b3325.webp) ![Daikin](https://climateshieldlondon.co.uk/projects/assets/img/brands/daikin.ce47c11f.webp) ![Mitsubishi Electric](https://climateshieldlondon.co.uk/projects/assets/img/brands/mitsubishi-electric.2977d309.webp) ![Bosch](https://climateshieldlondon.co.uk/projects/assets/img/brands/bosch.7d80a7ce.webp)

We replaced an ageing gas boiler in Mill Hill NW7 with a Vaillant aroTHERM plus air source heat pump in three days. The £7,500 Boiler Upgrade Scheme grant was approved within 48 hours, and the owner has a two-year support package from us.

The unit stands on a concrete pad close to the house, which keeps the pipe run short and the heat losses low.

## The job at a glance

Where

Mill Hill NW7, London Borough of Barnet

Heat pump

Vaillant aroTHERM plus

Replaced

An ageing gas boiler

Grant

£7,500, approved within 48 hours

Aftercare

Two-year support package

Time on site

Three days

## How the job was done

Step by step, in the photographs taken on site.

1. ![The aroTHERM plus on anti-vibration feet on a concrete pad close to the house.](https://climateshieldlondon.co.uk/assets/img/case/mill-hill-nw7-01-960.webp)   1 Close to the house The unit is on anti-vibration feet on a concrete pad near the house wall. A short pipe run loses less heat on the way in and costs less to fit.
2. ![The unit beside the house, with the garden clear behind it.](https://climateshieldlondon.co.uk/assets/img/case/mill-hill-nw7-02-960.webp)   2 Aftercare, not just a handover The job came with two years of support, so questions about the controls, the first winter and the first service all go to the people who fitted it.

## Thinking about a heat pump?

What this job involved, applied to your own house.

[Air source heat pumpsWhole-house heating with the £7,500 grantAir source heat pumps](https://climateshieldlondon.co.uk/air-source-heat-pumps-london/) [What a heat pump costsTen real quotations, before and after the grantWhat a heat pump costs](https://climateshieldlondon.co.uk/heat-pump-cost-london/) [Heat pump or air conditioning?Which one a house actually needsHeat pump or air conditioning?](https://climateshieldlondon.co.uk/air-conditioning-vs-air-source-heat-pump/) [Air-to-air heat pumpsHeats and cools, room by roomAir-to-air heat pumps](https://climateshieldlondon.co.uk/air-to-air-heat-pump-london/)

## Mill Hill NW7: questions about this job

### What happens after a heat pump is installed?

You are shown the controls on the day, you receive the MCS certificate and warranty paperwork, and the unit needs a service once a year to keep the warranty valid.

### Do you cover Barnet?

Yes. [Our work in Barnet](https://climateshieldlondon.co.uk/air-conditioning-barnet/).

## More of our finished work

Other jobs we have photographed. Tap one for the project.

[All 34 projects](https://climateshieldlondon.co.uk/projects/)

[![Daikin multi-split condenser in New Southgate N11](https://climateshieldlondon.co.uk/assets/img/projects/new-southgate-n11-ac-840.webp) Air conditioning N11 **New Southgate** Daikin multi-split condenser Wall-mounted on brackets rather than stood on the ground, which is usually what a narrow side return leaves you, and the refrigerant lines dropped in a single trunked run. Read the case study](https://climateshieldlondon.co.uk/projects/daikin-multi-split-new-southgate-n11/)[![Air source heat pump with roof-mounted solar in Winchmore Hill N21](https://climateshieldlondon.co.uk/assets/img/projects/winchmore-hill-n21-840.webp) Heat pump and solar N21 **Winchmore Hill** Air source heat pump with roof-mounted solar The panels sit across the rear pitch and the heat pump at the side of the house, which is the pairing that lets the pump run on its own generation through the middle of the day. Read the case study](https://climateshieldlondon.co.uk/projects/heat-pump-solar-battery-winchmore-hill-n21/)[![Samsung monobloc air source heat pump in Wood Green N22](https://climateshieldlondon.co.uk/assets/img/projects/wood-green-n22-840.webp) Heat pump N22 **Wood Green** Samsung monobloc air source heat pump Stood on a levelled base built up out of the border rather than on soil, so the feet stay out of standing water and the unit does not settle out of level over a winter. Read the case study](https://climateshieldlondon.co.uk/projects/samsung-heat-pump-wood-green-n22/)[![Samsung monobloc air source heat pump in Enfield EN3](https://climateshieldlondon.co.uk/assets/img/projects/enfield-en3-840.webp) Heat pump EN3 **Enfield** Samsung monobloc air source heat pump Set tight against the flank wall on anti-vibration feet, where it takes up none of the usable garden and the pipe run to the cylinder stays short. Read the case study](https://climateshieldlondon.co.uk/projects/samsung-heat-pump-enfield-en3/)[![Vaillant aroTHERM plus 7 kW air source heat pump in Enfield EN3](https://climateshieldlondon.co.uk/assets/img/projects/enfield-en3-vaillant-840.webp) Heat pump EN3 **Enfield** Vaillant aroTHERM plus 7 kW air source heat pump Stood on rubber anti-vibration blocks on the existing patio slabs rather than on a new base, against the rear fence and beside the drainage the house already had. Read the case study](https://climateshieldlondon.co.uk/projects/vaillant-heat-pump-enfield-en3/)[![Air source heat pump with solar and battery storage in Tottenham N15](https://climateshieldlondon.co.uk/assets/img/projects/tottenham-n15-840.webp) Heat pump, solar and battery N15 **Tottenham** Air source heat pump with solar and battery storage The whole electrical side on one wall: inverter, battery modules and every isolator in reach, with the conduit dressed in straight runs so a fault years from now can be traced without stripping the wall. Read the case study](https://climateshieldlondon.co.uk/projects/heat-pump-solar-battery-tottenham-n15/)[![Solar panels on ballasted frames, flat roof in Cricklewood NW2](https://climateshieldlondon.co.uk/assets/img/projects/cricklewood-nw2-solar-1260.webp) Solar and battery NW2 **Cricklewood** Solar panels on ballasted frames, flat roof Low-tilt frames standing on the pebble finish of a new-build flat roof and held down by weight, so nothing is fixed through the waterproofing, with a clear strip left along the parapet to walk and work from. Read the case study](https://climateshieldlondon.co.uk/projects/solar-battery-cricklewood-nw2/)[![Samsung monobloc air source heat pump in Camden NW1](https://climateshieldlondon.co.uk/assets/img/projects/camden-nw1-840.webp) Heat pump NW1 **Camden** Samsung monobloc air source heat pump Levelled on packers on an existing tiled patio rather than bolted through it, so the tiling stays intact and the unit still sits dead flat. Read the case study](https://climateshieldlondon.co.uk/projects/samsung-heat-pump-sunamp-camden-nw1/)[![Samsung Gen 7 12kW high temperature heat pump in North Finchley N12](https://climateshieldlondon.co.uk/assets/img/projects/north-finchley-n12-840.webp) Heat pump N12 **North Finchley** Samsung Gen 7 12kW high temperature heat pump On wall brackets on the side of the house, clear of the ground, which keeps the side passage usable and the coil away from leaves and splashback. Read the case study](https://climateshieldlondon.co.uk/projects/samsung-heat-pump-north-finchley-n12/)[![Cascade pair of air source heat pumps in Barnet EN4](https://climateshieldlondon.co.uk/assets/img/projects/barnet-en4-cascade-840.webp) Heat pump EN4 **Barnet** Cascade pair of air source heat pumps Two machines in cascade on a flat roof, flow and return in insulated copper with isolating valves on each leg, so one can be shut down and worked on while the other keeps the building warm. Read the case study](https://climateshieldlondon.co.uk/projects/cascade-heat-pump-barnet-en4/)

## Book a free heat pump survey

We measure every room, calculate the heat loss, check the radiators and the space for a cylinder, and send a written price with the grant already taken off. No cost and no obligation.

Call 020 3393 1331 [WhatsApp us](https://wa.me/447875564437?text=Hi%20Climate%20Shield%2C%20I%20have%20seen%20your%20Mill%20Hill%20NW7%20job%20and%20would%20like%20a%20survey.)

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Page updated 24 September 2026