Best hot water cylinder from these six listings
Updated: 17.10.2026
The best hot water cylinder in this set depends on a tiny store, a horizontal body or more capacity, not on the highest stars. Our [hot water cylinder comparison](/hub/hot-water/hot-water-cylinder) holds six direct electric wall stores from 30 to 120 litres, at £139.99–£259.99 on amazon.co.uk. The TESY 30 litre is the clearest small-store pick. The horizontal 50 and 100 litre models solve specific space problems. Each pick has a capacity or installation limit. Peter F. checked the listings, with no lab test. A qualifying purchase can earn a commission at no extra cost to you.
The best hot water cylinder in this set depends on a tiny store, a horizontal body or more capacity, not on the highest stars.
The best hot water cylinder in this set depends on a tiny store, a horizontal body or more capacity, not on the highest stars. Our hot water cylinder comparison holds six direct electric wall stores from 30 to 120 litres, at £139.99–£259.99 on amazon.co.uk. The TESY 30 litre is the clearest small-store pick. The horizontal 50 and 100 litre models solve specific space problems. Each pick has a capacity or installation limit. Peter F. checked the listings, with no lab test. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | Capacity | Element | Orientation | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  TESY TESY BiLight 30 litre | 30 litres | 1,500 W | Vertical | 8.8 | about £139.99 | View offer |
| Alternative |  TESY TESY BiLight 100 litre horizontal | 100 litres | 3,000 W | Horizontal | 7.2 | about £259.99 | View offer |
| Preis-Tipp |  TESY TESY BiLight 50 litre horizontal | 50 litres | 1,500 W | Horizontal | 6.5 | about £159.99 | View offer |
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What best can mean in this set
These products all heat stored water electrically and none describes a boiler or heat-pump coil. That makes them relevant to an all-electric flat, an annexe or a point-of-use project, but not automatically to a family replacing a full-size indirect cylinder. Before selecting a product, use the hot water cylinder buying guide to settle heat source, pressure system and installation requirements.
We prioritised stated capacity, a credible element rating, explicit box contents and a job the cylinder can cover. The shared 4.4-from-72 line on the TESY 30, 80 and 120 litre files is one set of texts, not three owner verdicts. Top pick means the strongest conditional choice among these six, not a UK-wide winner, and it does not override an installer’s calculations.
Small stores: 30 litres against two 50 litre models
The TESY BiLight 30 litre at £139.99 is the top pick for the smallest brief. The listing states 1,500 W, a 35 cm width, an 80°C maximum and temperature and pressure relief protection. Choose it only if 30 litres covers the draw. Pipe connections are not included.
The TESY BiLight 50 litre horizontal at £159.99 is the best-value step for a low cupboard. It states 1,500 W and a heat-up of 1 hour 18 minutes from 15°C to 60°C. The body is 81 cm wide and 38 cm high. It needs a 16 A fused spur, fixing bolts are not included, and there is no customer-rating line.
The GEESEN GK050 costs £219, states 2,000 W and includes a safety valve. The title says UK plug, but the contents also include an American NTP 1/2 adapter, and UK reviews mention a missing thermometer and delivery damage. Keep it when the 30 cm body and included valve matter.
Low cupboards: the horizontal TESY choices
The 50 litre and 100 litre horizontal TESY models answer the same placement problem at very different capacities. Low height is not a reason to ignore demand. Check what size hot water cylinder you need before the cupboard shape decides it.
The 100 litre horizontal model is 99.5 cm wide and 47 cm high, and it states 3,000 W. At £259.99 it is the most expensive item here. The package is cylinder only and requires a 3 bar temperature and pressure relief valve plus a 1.5 mm electrical cable. The model code contains 80 although the title says 100 litres, so confirm the vessel in writing. Choose horizontal because the measured envelope requires it, not because the photograph looks easier. A wide filled cylinder is a real wall load.
The 80 and 120 litre TESY listings
The TESY 80 litre at £234.99 prints its power as 1,500 kW. That is not a usable element rating, so recovery cannot be estimated. The listing states 65°C, energy class C and a two-year warranty, without a clear valve package.
The 120 litre TESY costs £254.99. It names a temperature and pressure safety valve and a thermal cut-out, but pipe connections are not included, and the wattage is printed as 220 W beside 220 V. A £20 gap over the 80 litre is not a reason to buy 40 extra litres when both power lines are unusable.
If demand points towards 120–180 litres, look outside this set. If a system boiler or heat pump should heat the water, read direct or indirect hot water cylinders, because none of these six states a coil.
Common questions
Which model is the top pick for a small flat?
The TESY 30 litre is the clearest small-store choice when 30 litres is enough: it costs £139.99 and states 1,500 W. It is not a general flat recommendation, because shower habits and occupancy can make that capacity inadequate. Confirm the installation kit and electrical supply first.
Which one is best value?
The TESY 50 litre horizontal is the best-value conditional pick when you specifically need a low cylinder. It costs £159.99, states 1,500 W and publishes a heat-up time. The value disappears if you need a normal plug, supplied fixing bolts or family-scale storage.
Is the GEESEN better because it says class A?
Not on that claim alone. The GEESEN does not state the load profile beside class A, so it cannot be compared reliably with the TESY profile-M declaration. Its included valve and 2,000 W rating are useful, but the American adapter and mixed reviews still need consideration.
Should I choose 120 litres because it is only £20 above the 80 litre?
Only after verifying recovery input and demand. Both listings have unusable watt figures, and their review texts are duplicated. More litres may reduce how often the store runs out, but they add filled weight and do not guarantee fast recovery.
Can the 50 litre models supply a family?
They should not be treated as family cylinders by default. The Hot Water Association starts with 35–45 stored litres per occupant as a rule of thumb, then adjusts for peak use and recovery. A single bath or strong shower can consume much of a small store.
Did you test these cylinders?
No. This selection compares amazon.co.uk listing data, captured UK review evidence and public guidance. It identifies specification strengths and gaps. It does not claim laboratory performance, measured energy use or an installed result.
Related pages
Sources
Public UK sources listed in the research digest, and the amazon.co.uk listings for these six cylinders. Prices in the digest were captured on 16 October 2026.
- Approved Document G (2024 amendments) (retrieved 16.10.2026)
- Part G FAQ (retrieved 16.10.2026)
- CNC Building Control: unvented hot water cylinder (retrieved 16.10.2026)
- Hot Water Association, unvented note (retrieved 16.10.2026)
- Hot Water Association, sizing a hot water cylinder (retrieved 16.10.2026)
- HSE: legionella and hot and cold water systems (retrieved 16.10.2026)
- Regulation (EU) No 812/2013 on legislation.gov.uk (retrieved 16.10.2026)
- TESY BiLight series (retrieved 16.10.2026)