This article contains affiliate links. We may earn a commission if you buy through our links, at no extra cost to you. iHeat’s Powerwall 3 prices are from iheat.co.uk, and Heatable names from their battery page, checked 19 August 2026 evening, and change from time to time, so the live quote is the figure that counts. Last reviewed: August 2026.
If you want a Tesla Powerwall 3, start with Heatable: they’re a Tesla Premium installer and will quote it, though they price it in their tool rather than publishing a cash figure. iHeat are the public number, listing the 13.5kWh unit plus inverter at £7,945 including VAT, or from £166 a month. There’s no Boiler Upgrade Scheme money on a battery, so the choice is really who quotes it and whether you want a published price or a Tesla Premium installer.
Both are MCS-certified and a Which? Trusted Trader. If you’re open to other brands, our best solar battery UK shortlist covers the wider quote order and the units with public floors.
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Tesla Powerwall 3: the short version
If you want the Powerwall 3 as a named package, start with Heatable. They’re a Tesla Premium installer and will quote it, though they price it in their tool rather than publishing a cash figure. iHeat are the public number, listing the 13.5kWh unit plus inverter at £7,945 including VAT, or from £166 a month, with a panels-plus-battery version at £9,845. Their list moves from time to time, so treat that as a snapshot. There’s no grant on a battery either way.
What iHeat publish for the Powerwall 3
iHeat put two Tesla rows on their price list. The standalone 13.5kWh unit plus inverter is £7,945 including VAT, from £166 a month, and the same unit with All Black 450W panels is £9,845, from £205:
| What iHeat publish | From (inc VAT) | Monthly from |
|---|---|---|
| Powerwall 3 13.5kWh + inverter | £7,945 | £166 |
| All Black 450W + Powerwall 3 | £9,845 | £205 |
Both cards carry an “up to £750 cashback” line, so treat that as a promo rather than money in your pocket until the quote confirms it applies. iHeat’s list also moves, so the £7,945 is the figure that was showing when checked on 19 August 2026, not a fixed price. The Powerwall 3 works without panels too, charging overnight on a cheap rate and discharging through the day, which is exactly what the standalone row is for, and Heatable have a without-solar path as well.
Heatable as the first quote
Heatable are a Tesla Premium installer, and their FAQ lists the Powerwall 3 alongside Sigenergy and Alpha ESS. One thing to watch: a shop tile on the same page still shows a Powerwall 2, but that’s an old label, they install the Powerwall 3, so quote the tool for the current unit.
They run both a with-solar and a without-solar path, price the job in their quote tool rather than a public list, and advertise 0% APR on batteries, with a typical one-day install and a minimum ten-year battery warranty. Their “pay nothing ’til 2027” line is the 0% VAT relief to 31 March 2027, tax rather than interest-free finance or a grant. Company detail is in our Heatable review, and iHeat’s is in our iHeat review.
Finance, VAT and what isn’t a grant
Heatable advertise 0% APR on batteries. iHeat show a monthly from-figure, but their published rate is 9.9% APR Representative (Fixed) on solar, so an iHeat battery isn’t a 0% deal, and iHeat’s heat-pump 0% is a separate product, not this one. There’s 0% VAT on qualifying solar and battery supply-and-install to 31 March 2027, then 5%, which is a tax break, not a grant, and there’s no Boiler Upgrade Scheme money on a battery at all, since that scheme is heat pumps only. Full grant rules are in our Boiler Upgrade Scheme guide. iHeat’s pages carry Which? Trusted Trader, MCS, an FCA credit-broker line and an Octopus Energy Trusted Partner badge.
Heatable as the Tesla Premium installer, iHeat for the published £7,945
Both are MCS-certified and a Which? Trusted Trader. Heatable price the job in their quote tool and advertise 0% APR on batteries; iHeat publish the £7,945 list price and a monthly from-figure. There’s no grant on a battery, and the 0% VAT to 31 March 2027 is a tax break, not finance.
- They install the Powerwall 3
- 0% APR available on batteries
- With-solar and without-solar paths
- MCS, Which?, about one day on site
- 13.5kWh plus inverter on their price list
- With panels from £9,845 / £205
- Solar finance 9.9% APR Rep. Fixed
- Which? Trusted Trader, MCS
How to buy
- Want a Tesla Premium installer: start with Heatable, whose tool is the price.
- Want a public number today: iHeat, at £7,945 or from £166 a month.
- No panels: both will quote the battery on its own, charging on a cheap night rate.
- Want panels too: iHeat from £9,845, or Heatable draw the roof; our solar panel cost guide covers panels and storage together.
- Different brand: the Sigenergy 6kWh or Fox ESS instead of Tesla, or the full best solar battery UK shortlist.
Pick Heatable when
- You want a Tesla Premium installer
- You want 0% APR on the battery
- You don’t need a public cash price today
- You may add panels or a heat pump with the same firm later
Pick iHeat when
- You want the published £7,945 / £166 figures
- You want a named 13.5kWh plus inverter row
- You want a monthly floor on the page
- You may add their 450W panel package
Frequently asked questions about the Tesla Powerwall 3
How much is the Powerwall 3 in the UK in 2026?
iHeat list the 13.5kWh unit plus inverter at £7,945 inc VAT, or from £166 a month, on 19 August 2026, with an All Black 450W panels version at £9,845 / £205. Heatable don’t publish a cash price, pricing your home in their quote tool instead.
Does Heatable still sell a Powerwall 2?
A shop tile on their page still shows a Powerwall 2, but that’s an old label. Their FAQ and body say they install the Powerwall 3, so the current unit is the Powerwall 3, not the 2.
Can I have a Powerwall 3 without solar panels?
Yes. You charge it overnight on a cheap rate and use the stored energy through the day. iHeat list the standalone row at £7,945, and Heatable have a without-solar path.
Is the £750 cashback guaranteed?
No. iHeat show “up to £750 cashback” on the Tesla cards, which is marketing rather than a guaranteed discount. Ask the quote what, if anything, applies to your job.
Is there a grant for this battery?
No. There’s no Boiler Upgrade Scheme money on a battery, since that scheme is for heat pumps. The 0% VAT on qualifying supply-and-install to 31 March 2027 is a tax break, not a grant.
Is iHeat’s battery finance 0%?
Their published rate is 9.9% APR Representative (Fixed) on solar, so an iHeat battery isn’t a 0% deal. Heatable do advertise 0% APR on batteries. Credit is subject to status, and HomeBoiler is not a credit broker.