This article contains affiliate links. We may earn a commission if you buy through our links, at no extra cost to you. Public prices are from iHeat’s own pages and Heatable names from their battery page, checked in August 2026, and change from time to time, so the live quote is the figure that counts. Last reviewed: August 2026.
There’s no single best solar battery for every house. The right pick depends on the size you need, your night-time electricity rate, and whether you already have panels. So this shortlist isn’t a scoreboard, it’s who to quote and what they charge, so you can skip the brand pages and go straight to a number that fits the battery, the finance and the home.
For most homes that’s Heatable first, then iHeat second. Heatable print a live cash price in their quote tool; iHeat publish a fixed catalogue with public from-prices. There’s no Boiler Upgrade Scheme money on a battery, and if you’re pricing panels at the same time our solar panel cost guide covers those alongside storage.
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The short version
Quote Heatable first if you want a Tesla Powerwall 3, Alpha ESS or Sigenergy with 0% APR on the battery. They print a live cash price in their quote tool rather than a public list, and on a recent evening that was Alpha ESS from £5,690, Sigenergy from £6,100 and a Powerwall 3 from £7,595, figures that move with your postcode. Quote iHeat second for a wider list and public from-prices, starting at a Hanchu 5kWh with inverter at £3,645, about £76 a month. There’s no grant on a battery, and the 0% VAT to 31 March 2027 is a tax break, not finance.
Heatable or iHeat: who to quote
Heatable price your home rather than a shelf. Their quote tool returns a live cash price for a Powerwall 3, Sigenergy or Alpha ESS, they’re a Tesla Premium installer, and they advertise 0% APR on batteries, with a typical one-day install and a minimum ten-year battery warranty. They don’t list Fox. Full company detail is in our Heatable review.
iHeat run a fixed catalogue, which makes them the easy place to see a public number and to compare named batteries. Their floor is a Hanchu 5kWh with inverter at £3,645 (about £76 a month), with a Sigenergy 6kWh at £5,245 (£109) and a Tesla Powerwall 3 at £7,945 (£166) further up. They also sell Fox on a brand page. Their published finance rate is 9.9% APR Representative (Fixed) on solar, so don’t read their battery monthly figures as 0%. Detail is in our iHeat review.
Which battery each firm installs
The two lists only partly overlap, so the brand you want can decide who you quote. These are the public iHeat figures from 19 August 2026, against what Heatable fit:
| Brand | Heatable | iHeat public figure |
|---|---|---|
| Tesla Powerwall 3 (13.5kWh) | Yes, Premium installer (quote tool) | £7,945 / £166 (£9,845 / £205 with 450W panels) |
| Sigenergy | Yes (quote tool) | 6kWh + inverter £5,245 / £109 |
| Alpha ESS | Yes (quote tool) | Not listed as a from-price |
| Hanchu ESS | Not listed | 5kWh + inverter £3,645 / £76 |
| Fox ESS | Not listed | Sold on a brand page, no public from-price |
A couple of things the table doesn’t show: iHeat carry a Duracell partner badge but don’t list a standalone Duracell battery, so Duracell only appears inside a solar bundle, not as a battery-only price. And a Heatable shop tile still shows a Powerwall 2, though they install the Powerwall 3, so quote the tool for the current unit. For a closer look at two of the batteries both firms fit, see our Alpha ESS review and Sigenergy battery review.
VAT, finance and the grant
Three things get mixed up on battery quotes, so it’s worth separating them. There’s 0% VAT on qualifying solar and battery supply-and-install until 31 March 2027, after which it returns to 5%, and that’s a tax break, not a grant. There’s no Boiler Upgrade Scheme money on a battery at all, so ignore anyone implying a battery grant. And on finance, Heatable advertise 0% APR on batteries, while iHeat’s published rate is 9.9% APR (their solar rate), so the two aren’t the same and an iHeat monthly figure isn’t a 0% deal.
Heatable first for Tesla, Alpha or Sigenergy, iHeat for the wider list
Both are MCS-certified and a Which? Trusted Trader. Heatable price your home in their quote tool and advertise 0% APR on batteries; iHeat publish public from-prices and carry a wider range including Fox. There’s no grant on a battery either way.
- Tesla Powerwall 3, Alpha ESS, Sigenergy
- Tesla Premium installer, 0% APR on batteries
- With-solar and battery-only paths
- ~1 day install, 10-year battery warranty minimum
- Hanchu, Sigenergy, Tesla and Fox
- Public monthly from-figures shown
- Solar finance 9.9% APR Rep. Fixed
- MCS + Which? Trusted Trader
How to buy
- Tesla, Alpha ESS or Sigenergy: Heatable first, with iHeat as the public number on Tesla and Sigenergy.
- Hanchu or Fox: iHeat, since Heatable don’t list those.
- No panels yet: both fit a home battery on its own, so ask for the battery-only path.
- Adding panels too: price them together, since the battery is sized against what the panels generate.
Pick Heatable when
- You want a Tesla Powerwall 3, Alpha ESS or Sigenergy
- You want 0% APR on the battery
- You want a Tesla Premium installer
- You may add a heat pump with the same firm
Pick iHeat when
- You want a published from-price today
- You want Hanchu or Fox
- You want the £3,645 floor
- You want a monthly figure on the page
Frequently asked questions about solar batteries
Which battery does each firm install in 2026?
Heatable fit the Tesla Powerwall 3, Sigenergy and Alpha ESS; iHeat carry Hanchu, Sigenergy, Tesla and Fox. Heatable don’t list Fox, and iHeat don’t use Alpha as a public from-price, so the brand you want can decide who to quote.
What’s the cheapest solar battery price?
The cheapest public figure is iHeat’s Hanchu 5kWh with inverter at £3,645, about £76 a month. Heatable don’t publish a floor, instead their quote tool prices your home directly, so you’d compare that live figure against iHeat’s list.
How do you choose the right battery?
This page is about who to quote, not a product score, because the survey and your tariff decide whether a given battery is the right size for your home. Match the battery to your usage and night-time rate, and let the quote confirm the price and sizing.
Is there 0% finance on a battery?
Heatable advertise 0% APR on batteries. iHeat show monthly from-figures, but their published rate is 9.9% APR Representative (Fixed) on solar, so an iHeat battery isn’t a 0% deal. Check what applies on your quote.
Where is Fox priced?
iHeat sell Fox on a brand page, but there was no public from-price on that page on 19 August 2026, so you’d need a quote for the number. Heatable don’t fit Fox at all.
Is there a grant for a solar battery?
No. There’s no Boiler Upgrade Scheme money on a battery. The 0% VAT to 31 March 2027 on qualifying supply-and-install is a tax break, not a grant, and it returns to 5% after that.