Instant hot water, a quarter of the space.
The Sunamp Thermino replaces your bulky hot water cylinder with a quiet, compact heat battery. Mains-pressure flow on demand, ten-year warranty, and bills that actually fall.
- 4×
- Smaller than a cylinder
- 10 yr
- Thermal core warranty
- 1 day
- Typical install time
- 0
- Servicing required
What it is
Cleverer than a cylinder. Cleaner than a combi.
At the heart of every Sunamp Thermino is a phase-change material that stores heat four times more densely than water. When you turn on a tap, mains-cold water passes through the battery and comes out the other side hot, instantly, at full pressure, without ever sitting in a tank.
- Heats during cheap off-peak hours (or from solar surplus)
- Stores the energy in solid phase-change cells, so there's no tank and no risk
- Releases mains-pressure hot water on demand to every outlet
- Recharges automatically once below its set level
The size difference
The footprint that won an industry award.
Same hot water output. A fraction of the space. Visualised at the same scale.
Traditional hot water cylinder
Tall, heavy, loses heat 24/7
Sunamp Thermino
Wall-hung or floor-stood, zero standing loss
Why families switch
The four things you'll notice in week one.
Endless mains-pressure hot water
Instant flow at full pressure, with no waiting, no top-ups, and no warm-then-cold surprises mid-shower.
Up to a quarter of the space
Fits where a hot water cylinder never could: under stairs, in a slim utility cupboard, beneath a worktop.
Charges off-peak or from solar
Pair it with Economy 7, Octopus Go, or rooftop solar to bank your hot water when energy is cheapest.
10-year warranty, zero maintenance
No anodes, no servicing, no annual safety check. Charge it, use it, forget it.
Sound familiar?
Three problems the Sunamp quietly fixes.
Running out of hot water by bath number two
Cylinders cool while you wait. Sunamp doesn't. It heats on demand, in seconds.
Losing a whole airing cupboard to a tank
Reclaim the cupboard. The Sunamp is roughly the size of a kitchen unit.
Bills that creep up every winter
Phase-change storage means less standing loss, lower running cost, and clean off-peak charging.
Who it's for
Built for the way real homes actually use hot water.
The Sunamp suits a wider range of homes than any cylinder ever could. Pick the type closest to yours and let us tell you which Thermino we'd recommend.
Family homes
Especially anyone fed up running out of hot water at peak times.
Flats & apartments
Where every cubic foot counts and a cylinder simply won't fit.
Solar PV owners
Capture surplus generation as stored heat instead of exporting it cheap.
Holiday lets & second homes
Remote control, fast recovery, no Legionella worries when empty for weeks.
Renovation & new-build
Plan it in early, because it changes what you can do with your service rooms.
Pairs perfectly with solar
Capture solar surplus as stored hot water.
Instead of exporting your unused solar generation back to the grid for pennies, the Sunamp stores it as heat, ready for the next shower, the next sink full, the next load of washing. It's the simplest, lowest-fuss way to actually use the electricity your roof makes.
See how it works with solar
Not quite ready to book?
Take the full brochure away with you: sizes, colours, pricing and everything our systems can do. Or book a free home survey whenever the time is right. No pressure, no hard sell.
How we install it
Cylinder out, Sunamp in, all in a day.
Step 01
Free home survey
One of our engineers, never a salesperson, comes to size your hot water demand.
Step 02
Tailored proposal
We pick the right Thermino capacity, plan the install, and quote you the same day.
Step 03
Clean one-day install
Cylinder out, Sunamp in, dust sheets down, your old space back. Usually before tea-time.
Capacities & sizing
From 3.5 kWh to 14 kWh, we'll size it right.
The Thermino range covers everything from a one-bed flat to a busy family home. Final sizing is always done on-site during your free survey.
| Model | Capacity | Typically suits |
|---|---|---|
| Thermino 70i | 3.5 kWh | 1-bedroom flat · single bathroom |
| Thermino 150i | 5.7 kWh | 2-3 bed home · 1-2 bathrooms |
| Thermino 210i | 8.7 kWh | 3-4 bed home · 2 bathrooms |
| Thermino 300i | 14 kWh | Larger homes · 3+ bathrooms or higher demand |
Sunamp vs hot water cylinder
The side-by-side, no marketing spin.
- FootprintTall (typically 800–1500mm) and wideUp to 4× smaller
- Hot water outputDrops as the tank coolsConstant, mains pressure
- Standing heat lossContinuous loss to roomNegligible, thanks to phase-change storage
- MaintenanceAnode rod, drain-down, annual checkNone
- Legionella riskRequires managementNone (water heated on demand)
- WarrantyUsually 5 years10 years on the core
From a real install
“Just had our Sunamp Boiler fitted and we couldn't be more pleased with it. Tom came to the house after we got in touch with North West Electric Radiators. He went through everything with us, explaining everything in detail, advising us on what size boiler would be right for us and answering any questions we had. We arranged the installation for today which Richard and Cameron done for us. They both done a very professional job and left everywhere clean and tidy.”
David Strode
Verified Google review
Common questions
Honest answers, in plain English.
Got one we haven't covered? Give us a call. We'd rather talk through it than write you a brochure.
Want to see one in your home?
Book a free home survey and we'll size, price, and plan the swap in a single visit. Same-day quote, no obligation.