Venus E Gen 3.0 Plug-in Battery 5.12kWh LFP 2.5kW AC Expandable to 15.36kWh with AI Mode
£629.99 inc. VAT
In stock
- 5.12kW
- Free UK mainland delivery
- Genuine UK stock
- Manufacturer warranty
- 14-day returns
About this fire
The MARSTEK Venus E Gen 3.0 is a plug-in battery with 5.12 kWh of LFP storage capacity and 2.5 kW of AC input and output, giving you smart energy management and lower running costs.
- 5.12 kWh of storage capacity, expandable to 7.5 kW / 15.36 kWh in single-phase operation → so you can add capacity flexibly as your energy needs grow, without having to replace the whole system
- 2.5 kW AC input and output with up to 2500 W of reliable backup power → keeps essential household appliances running during a power cut and gives you peace of mind in an emergency, without charging being too slow
- AI mode for smart energy management → automatically optimises your energy use and charge cycles so you cut your electricity costs without having to intervene manually
- 100% PV system compatibility with zero export via smart meter → integrates easily into existing solar installations and avoids exporting to the grid, so you use all the power you generate yourself
- LFP battery technology with over 6000 cycles, up to 15 years of service life and a 10-year warranty → works reliably for many years and lowers your long-term energy costs, with no worries about early battery wear
- IP65 rating and reliable operation across a wide temperature range → so you can use the battery outdoors all year round without any concerns about long-term durability
Perfect for homeowners and renters who want to cut electricity costs and build energy independence, and for anyone looking for a future-proof, expandable solution. Genuine product, as-new condition. The plug-in design means no complicated installation work – you can start straight away and benefit from higher savings through AI-driven energy management, with no technical expertise required.
Questions about buying a fire
Can I use this in a smoke control area?
Only if the appliance is DEFRA approved — look for the DEFRA mark on this page. Under the Clean Air Act most UK towns and cities are smoke control areas, where you may burn smokeless fuel, or wood in an appliance DEFRA has exempted. Burning wood in a non-exempt stove in one of those areas can carry a penalty from your local authority. Gas, electric and bioethanol fires are not affected by smoke control rules.
What size stove (kW) do I need for my room?
As a rough guide, measure the room in metres, multiply length × width × height and divide by 14. A 5m × 4m room with a 2.4m ceiling gives about 3.4kW. Most British living rooms land between 4kW and 6kW. Oversizing is the common mistake — a stove run too cool tars up the flue and blackens the glass. Well-insulated or new-build homes should size down; a draughty solid-wall cottage should size up.
Who installs it?
You do, or an installer you appoint — we supply the appliance only and do not offer or arrange installation. A solid fuel appliance must be installed to Building Regulations Document J and signed off; a registered installer (HETAS or equivalent) can self-certify, otherwise you must notify building control before work begins. Gas appliances must by law be fitted by a Gas Safe registered engineer. Bioethanol and electric fires need no flue and no notifiable work.
What flue or liner will it need?
That depends on the appliance and on your chimney, so have your installer confirm it before you order. As a general picture: into an existing masonry chimney a stove normally needs a flexible stainless liner sized to its flue outlet; with no chimney, a twin-wall insulated system can be run internally or up an external wall; a balanced-flue gas fire needs only an external wall; and bioethanol needs no flue at all, only adequate room ventilation.
How will it be delivered?
Boxed on a pallet, kerbside, on a tail-lift vehicle to the nearest hard standing — free to UK mainland on orders over £500. Stoves are heavy, so have two able people ready to move it from the kerb. Highlands, islands and Northern Ireland run on a longer schedule with any surcharge quoted at checkout.
What about warranty and spare parts?
Everything we sell is new, genuine UK stock and carries its manufacturer's warranty, which you register with the manufacturer after installation. Wearing parts such as rope seals, glass, baffles and grates are consumables and are not covered by warranty — we can supply them for the models we stock.
MARSTEK Venus E Gen 3.0 Plug-in Battery 5.12kWh LFP 2.5kW AC Expandable to 15.36kWh with AI Mode
£629.99 inc. VAT