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COMPACT THERMAL BATTERY · HOT-WATER STORAGE
A compact thermal battery that stores hot-water energy in a salt block instead of in a tank of water. Up to four times smaller than the cylinder it replaces, with vacuum-insulated low standing losses.
Free hot water from surplus solar
PAIRS WITH ROOFTOP PV
Up to 4× smaller than a cylinder
SAME USABLE HOT WATER
Vacuum insulation, tiny standing loss
27 W ON THE 6E (BEST IN CLASS)
Charges in about 2.5 hours
FULL FROM COLD · 6E SIZE
Two variants for any system
G2 E DIRECT · G2 D INDIRECT
No moving parts, sealed for life
FIT-AND-FORGET
Charge from PV, electric, heat pump, boiler
WORKS WITH ANY SETUP
100% recyclable, no combustion
PART OF AALBERTS NV INDUSTRIAL GROUP
Inside the unit is a special inorganic salt material — not water. When you put heat into it, the salt softens (melts at around 70°C). When you take heat out, the salt sets again. The temperature stays steady the whole time, like an ice pack in reverse.
Salt holds about four times more heat per litre than water does. A FlexTherm Eco 6E gives roughly the same usable hot water as a 140-litre cylinder — in less than a quarter of the space. For tight London airing cupboards, this matters.
A vacuum-insulation panel wraps the salt core, cutting standing heat losses to about 27 W on the 6E size. That's a fraction of what an old insulated cylinder loses (roughly 50–100 W). Less wasted heat, lower standing-loss bills.
A full charge from cold takes about 2.5 hours on the 6E. Charging energy can come from grid electricity, surplus rooftop PV, a heat pump, or an existing boiler. The right variant (G2 E or G2 D) makes that choice work seamlessly.
G2 E (electric direct) replaces a direct hot-water cylinder — uses electricity only. G2 D (indirect) replaces an indirect cylinder — can be charged by a heat pump, a boiler, district heating, or grid electricity, with PV on top. Pick the right one at order.
The mains water flows through a heat exchanger inside the unit — never sits stagnant. Less than a few litres at any time, so no legionella risk. The salt block is sealed for life, no top-ups, no anode, no annual flush. Fit and forget.
Smart controller schedules charging on the cheapest energy source available — PV when sunny, off-peak overnight, heat pump when running.
FlexTherm app · iOS / Android
Monitor charge level (like a phone battery for hot water), see today’s charging sources, override schedules manually. Set up once at install — minimal interaction needed after.
Off-peak tariff scheduling
Schedules charging during the cheapest electricity windows — Octopus Go, Cosy, Agile, or any time-of-use tariff. The vacuum insulation holds heat for days, so timing the charge precisely matters less than with a cylinder.
Solar PV priority
If you have solar, the controller takes surplus generation first. Pairs especially well with battery storage — PV during the day, battery in the evening, off-peak grid as backup.
Heat-pump integration
In systems with both a heat pump and PV, the FlexTherm switches charging source automatically based on what’s cheaper at that moment — heat pump efficiency vs spot PV output.
Smart-grid module (optional)
Optional smart-grid module enables demand-response tariffs — charging when grid carbon intensity is low or when the supplier offers negative pricing during surplus generation periods.
CleverBloom can help
Choosing the right charging source priorities and setting up smart-grid features is a quick conversation at install — or any time after.
FlexTherm Eco G2 fits into much smaller spaces than a cylinder. A water connection and a 230 V mains feed are all that's required. Any qualified plumber and electrician can fit it — no specialist certification needed.
What’s inside the Flamco FlexTherm — the parts that store heat in a sealed box up to 4× smaller than a cylinder, with almost no standing loss.
1 · Phase-change-material core
A sealed block of phase-change material at the heart of the unit. Stores 4× more heat per litre than water. Melts when charging, sets when discharging, temperature stays steady throughout the cycle.
2 · Vacuum insulation panels
The key differentiator. Vacuum-insulated panels surround the core — like a giant thermos flask. Standing loss is just 27 W on the 6E variant (smaller than a single LED bulb). Heat held for days without significant loss.
3 · Mains-pressure DHW exchanger
A stainless steel coil runs through the PCM core. Cold mains water flows through the coil on demand — comes out hot at the tap. No stored hot water, no legionella risk.
4 · Multi-source charging input
The FlexTherm can charge from any heat source — surplus solar PV, off-peak electric, heat pump output, or boiler return. The input is configured per install to match what you have or what you’re planning.
5 · Smart controller
Schedules charging on cheap-rate tariffs, prioritises solar PV, runs system diagnostics. Wi-Fi enabled, connects to phone app for monitoring. Optional smart-grid module for demand-response tariffs.
6 · Charge sensors
Temperature sensors in the PCM core tell the controller how much energy is stored and when it’s time to recharge. Real-time charge level visible in the app — like a phone battery for hot water.
7 · Sealed for life
The unit is sealed at the factory. No moving parts inside, no fluids to top up, no anode to replace. The PCM is rated for thousands of charge cycles — effectively the working life of the building.
8 · CleverBloom can help
Sizing the right FlexTherm variant (6E for compact, 10E for larger demand) and choosing the right charging source(s) is a design conversation we have during the site visit.
FlexTherm Eco G2 is a sealed thermal battery with no moving parts. The salt material doesn't degrade with use. Annual visual check during the heating-system service is enough.
Manufacturer warranty
Flamco's standard warranty applies per their published policy at the time of order. The salt material can be charged and discharged indefinitely without loss of efficiency, so real-world product life is long.
No legionella, no descaling
Cold mains water passes through a heat exchanger and out to the tap with very little residence time, so legionella has no chance to grow. There's no large tank of standing hot water to descale or treat. The salt core needs no service.
Sealed unit
The salt is sealed inside the unit. No top-up, no inhibitor, no anode replacement. The water-side heat exchanger gets a magnetic filter on the heating circuit (good practice for any system).
Hidden, no homeowner action
Once installed, the unit lives in its cupboard. Apart from glancing at the controller occasionally, the homeowner never interacts with it. Charging schedules can be set once and left alone for years.
100% recyclable end-of-life
No toxic substances inside. The salt material, the steel casing, and the heat exchangers are all recyclable. Compared to a typical cylinder full of inhibitor-treated water, end-of-life disposal is cleaner.
European manufacturer support
Flamco is part of Aalberts NV, a major European HVAC industrial group based in the Netherlands. UK technical support and spares come via Flamco's European service network. CleverBloom handles UK design and project coordination.
Heat pump unit only. Radiators, UFH, and emitters are on the heating page.
From £2,800
supply & install · before VAT · FlexTherm Eco G2 6E with electric (G2 E) charging
From £2,800
supply & install · before VAT · FlexTherm Eco G2 6E with electric (G2 E) charging
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