# Heat Pump, Solar and Powerwall 3, Hemel Hempstead

> A Samsung 12kW heat pump, 8.65kWp of solar and a Tesla Powerwall 3 in Hemel Hempstead HP1, installed together as one home energy system.

*Climate Shield London — https://climateshieldlondon.co.uk/projects/heat-pump-solar-powerwall-hemel-hempstead-hp1/. Verbatim from the page; this is the same content, not a summary.*

---

![The Samsung heat pump and the Tesla Powerwall 3 on the same wall.](https://climateshieldlondon.co.uk/assets/img/case/hemel-hempstead-hp1-01-960.webp)

# Heat pump, solar and a Powerwall 3 in Hemel Hempstead

A Samsung 12kW high temperature heat pump, 19 solar panels making 8.65kWp, and a Tesla Powerwall 3 storing 13.5kWh.

[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%20Hemel%20Hempstead%20HP1%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 installed a Samsung 12kW high temperature heat pump, an 8.65kWp solar system of 19 Jinko panels and a Tesla Powerwall 3 at a house in Hemel Hempstead HP1. The Powerwall stores 13.5kWh through its built-in 11.04kW hybrid inverter and keeps power available during a grid outage.

Hot water comes from a 300-litre Tempest unvented cylinder with a 50-litre buffer. The solar part of the installation qualifies for 0% VAT.

## The job at a glance

Where

Hemel Hempstead HP1, Hertfordshire

Heat pump

Samsung 12kW high temperature, R290

Hot water

Tempest 300-litre unvented cylinder, 50-litre buffer

Solar

19 Jinko panels, 8.65kWp

Battery

Tesla Powerwall 3, 13.5kWh, built-in 11.04kW inverter

Controls

Hive wireless thermostat

Warranty

10 years on the Powerwall

## How the job was done

Step by step, in the photographs taken on site.

1. ![The Samsung heat pump and the Tesla Powerwall 3 on the same wall.](https://climateshieldlondon.co.uk/assets/img/case/hemel-hempstead-hp1-01-960.webp)   1 Heat pump and battery side by side The heat pump and the battery are on the same elevation, so the pump can run on stored solar generation through the evening instead of on the most expensive electricity of the day.
2. ![The Powerwall 3 and its gateway, with the cables in trunking below.](https://climateshieldlondon.co.uk/assets/img/case/hemel-hempstead-hp1-02-960.webp)   2 A battery with its own inverter The Powerwall 3 has an 11.04kW hybrid inverter built in and a round-trip efficiency of 97.5%, so the panels charge it directly with very little lost on the way.

## 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/)

## Hemel Hempstead HP1: questions about this job

### Does a Powerwall keep the power on in a power cut?

The Powerwall 3 can supply the house during a grid outage when it is installed with the backup equipment. We explain what it will and will not run at the survey.

### Do you work outside London?

Yes, in the home counties around London, including Hertfordshire, as here.

## 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%20Hemel%20Hempstead%20HP1%20job%20and%20would%20like%20a%20survey.)

Monday to Friday 9am to 7pm, Saturday 10am to 3pm, Sunday closed

Page updated 24 September 2026