Bin the cylinder. Reclaim the cupboard.
Four problems your current hot water system causes, and how the Sunamp Thermino fixes each one. Followed by an unvarnished side-by-side comparison.
Sound familiar?
Four reasons people switch, and the Sunamp answer.
Running out of hot water mid-shower
Sunamp heats on demand. There's no ‘tank’ to drain, just mains pressure and constant flow, until the kids leave the bathroom.
Losing a whole cupboard to a cylinder
The Sunamp Thermino is up to a quarter of the size. Most installations free up an entire airing cupboard.
Watching standing-loss bills creep up
Phase-change storage holds heat far longer than water. Standing losses are a tiny fraction of a cylinder's, and your bills follow.
Annual servicing, anode swaps, drain-downs
None of it. Sunamp has no anodes, no service intervals, no annual paperwork. Charge it, use it, forget it.
Side-by-side
Sunamp vs cylinder vs electric boiler.
No marketing spin: the same row, three honest answers.
| Feature | Hot water cylinder | Electric boiler | Sunamp Thermino |
|---|---|---|---|
| Energy source | Gas / oil / electric (immersion) | 100% electric | 100% electric · works with solar |
| Footprint | Tall (typically 1200–1500mm) | Wall-hung, no tank | Up to 4× smaller than cylinder |
| Hot water output | Drops as tank cools | Constant, depends on flow rate | Constant, mains-pressure, on demand |
| Standing heat loss | Continuous loss | None (heats on demand) | Negligible, thanks to phase-change storage |
| Annual maintenance | Anode, drain-down, safety check | Annual service | None |
| Lifespan | 10–15 years | 10–15 years | Designed for 50+ years |
| Solar pairing | Limited (immersion bypass only) | Yes | Yes, and stores surplus |
The honest cost story
Upfront, running, lifetime: all three matter.
Upfront cost
Comparable to a quality cylinder + immersion system, slightly lower than a full combi-replacement. Free survey gives a real number, on the day.
Running cost
Lower than a gas cylinder system on most tariffs, and dramatically lower when paired with off-peak Economy 7 / Octopus Go, or solar PV.
Lifetime cost
No annual service, no anode, no drain-down, no eventual replacement at year 15. The cheapest hot water you'll have over 20 years.
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.”
David Strode
Verified Google review
Convinced? Or want to talk it through first?
Either way: free survey, same-day quote, no hard sell.