This article contains affiliate links. We may earn a commission if you buy through our links, at no extra cost to you. The prices below are snapshots from Heatable and iHeat’s own tools on the dates noted and move often, so treat the live quote as the figure that counts. Last reviewed: August 2026.
If you want an Alpha ESS battery fitted, the fastest way to a real number is Heatable, whose quote tool last printed the Alpha ESS from £5,690 on the evening of 20 August. Treat that as a snapshot rather than a live promise, and pull today’s figure from the tool. Here’s the catch worth knowing before you compare anything: a battery’s headline price means very little until you know the usable capacity behind it, and Heatable’s Alpha tile doesn’t print a single kWh size, so the number to judge is the one the quote returns for your home.
iHeat list the same brand and make a sensible second quote. If you’re still deciding on size, or whether to pair the battery with panels at all, start with our guide to the best solar and battery setups and whether a home battery without solar stacks up for your home.
★★★★★
4.8 from 14,000+ reviews
★★★★★
4.8 from 10,000+ reviews
The short version
Heatable is the quickest route to a real Alpha ESS price, and its tool last showed the battery from £5,690 on the evening of 20 August. That’s a genuine cash figure rather than a teaser, but it’s a snapshot, so use the live tool for today’s number and the capacity that suits your home. The battery itself is a well-specified LiFePO4 hybrid with a 10-year warranty that scales as your needs grow. iHeat sell the same brand and are worth a second quote, though their Alpha page doesn’t print a public price this morning. Because the Alpha tile doesn’t show a single kWh size, compare on the usable capacity each quote returns, not the headline alone.
Alpha ESS on Heatable
Heatable list the Alpha ESS G3 as a live tile on their battery-storage page, with a 10-year warranty, UK support, and a system that scales to 60.6kWh, fitted floor or wall, indoors or out. Their quote tool last logged the Alpha ESS from £5,690 on the evening of 20 August, alongside a Sigenergy 9.04kWh from £6,100 and a Tesla Powerwall 3 from £7,595. Those are snapshots rather than live prices, so the tool is where you get today’s figure for your home.
Heatable are MCS-certified and a Which? Trusted Trader, with a Trustpilot score of 4.8 from more than 14,000 reviews. Two labels worth reading correctly. The shop still shows a Powerwall 2 in places, but they install the Powerwall 3. And their “0% APR on batteries” and “pay nothing ’til 2027” are two separate things: the first is finance, the second is the 0% VAT relief that runs to 31 March 2027, not free credit.
Alpha ESS on iHeat
iHeat run a dedicated Alpha ESS brand page headed “Get Alpha ESS prices”, but it doesn’t print a cash figure for the Alpha this morning, so with iHeat the price comes back through a quote rather than a published row. For a sense of where their battery pricing sits, their public battery-only table lists a few other units, though none of them is the Alpha:
| iHeat battery (not Alpha) | Capacity | From | Monthly from |
|---|---|---|---|
| Hanchu | 5kWh | £3,645 | £76 |
| Sigenergy | 6kWh | £5,245 | £109 |
| Tesla Powerwall 3 | 13.5kWh | £7,945 | £166 |
iHeat are MCS-certified and a Which? Trusted Trader too, with a Trustpilot score of 4.8 from more than 10,000 reviews. On finance, their solar plans start from 9.9% APR Representative Fixed, so it isn’t the 0% you’ll see advertised on the Heatable side. Take the Alpha figure from an iHeat quote and hold it against Heatable’s.
The Alpha ESS SMILE G3: the manufacturer’s spec
Alpha ESS’s own specification for the SMILE G3, its current hybrid range, gives a fuller technical picture than either installer tile. It’s a hybrid inverter and battery using LiFePO4 cells, with a 10-year warranty. The single-phase version runs at 5kW with storage from 3.8kWh to 37.2kWh, while the three-phase version runs at 4 to 20kW and stacks up to 111.6kWh. Those figures are Alpha’s, taken from their European site.
Heatable quote the Alpha ESS G3 as scalable to 60.6kWh but don’t print a single kWh size on the tile, so treat the manufacturer’s range as the technical envelope and let your quote confirm the capacity that actually fits your home and usage.
VAT and grants on battery storage
There’s no Boiler Upgrade Scheme money for solar or batteries, so ignore anyone implying a heat pump-style grant here. What you do get is 0% VAT on qualifying residential supply-and-install of solar and batteries until 31 March 2027, after which it returns to 5%. That relief is exactly what Heatable’s “pay nothing ’til 2027” line refers to, and it applies to a battery on its own, not only alongside panels.
Separately, the Warm Homes: Local Grant can include solar for qualifying households in England, so it’s worth checking whether you’re eligible before you buy.
Two Alpha ESS quotes, one live from-price
Both installers are MCS-certified and a Which? Trusted Trader. Start with Heatable, which prints a real from-price in the tool, then take a second number from iHeat, whose Alpha price comes back through a quote. Compare on the usable capacity each one returns, not just the headline.
- Alpha ESS G3, scalable to 60.6kWh
- 10-year warranty, UK support
- 0% APR advertised on batteries
- MCS + Which? Trusted Trader
- Dedicated Alpha ESS brand page
- No public Alpha cash row, price via quote
- Solar finance from 9.9% APR Rep. Fixed
- MCS + Which? Trusted Trader
Who the Alpha ESS is for
The Alpha ESS suits you if you want a scalable LiFePO4 hybrid battery with a 10-year warranty, and you’d rather get a real from-price quickly, which is where Heatable’s tool earns its place. It’s also a fair pick if you want to weigh a mainstream brand against a Tesla Powerwall 3 or a Sigenergy, since both installers stock all three.
If you don’t have solar yet, the battery still qualifies for 0% VAT on its own until March 2027, so a retrofit is worth pricing. And if you already know you want a specific rival unit, quote that instead. The point of taking both a Heatable and an iHeat number is to see the real capacity and price for your home and your usage, rather than buying on a headline figure alone.
Frequently asked questions
How much is an Alpha ESS battery in the UK?
Heatable’s quote tool last printed the Alpha ESS from £5,690 on the evening of 20 August. iHeat list the brand but don’t publish an Alpha cash price, so their figure comes back through a quote. Both are snapshots and both depend on the capacity sized to your home, so use the live tools for today’s numbers.
Is there a grant for battery storage?
No. The Boiler Upgrade Scheme does not cover solar or batteries. You do get 0% VAT on qualifying residential solar and battery installs until 31 March 2027, after which it rises to 5%. The Warm Homes: Local Grant can also include solar for qualifying households in England.
What warranty does the Alpha ESS come with?
Ten years. That figure appears on both Heatable’s Alpha ESS G3 tile and Alpha ESS’s own SMILE G3 specification.
Can I get an Alpha ESS battery without solar panels?
Yes. A home battery can be fitted on its own, and it still qualifies for the 0% VAT relief until March 2027. Whether a battery without panels pays off depends on your tariff and usage, which our home battery without solar guide covers in detail.
What is the Alpha ESS SMILE G3?
It’s Alpha ESS’s current hybrid inverter and battery, using LiFePO4 cells. Alpha’s own spec lists a single-phase 5kW version with 3.8kWh to 37.2kWh of storage, and a three-phase 4 to 20kW version that stacks up to 111.6kWh. Heatable quote the G3 as scalable to 60.6kWh but don’t print a single kWh size, so your capacity is confirmed at the quote.
Is Heatable’s “pay nothing ’til 2027” free finance?
No. That line refers to the 0% VAT relief that runs until 31 March 2027, not to interest-free credit. Heatable separately advertise 0% APR on batteries, so check your quote to see which one applies to your order.