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Best 80 litre hot water cylinder in this Amazon set

Updated: 21 October 2026

You already want an 80 litre electric store, and you want a short answer on the best 80 litre hot water cylinder from the five amazon.co.uk listings we kept. None of them has 100 reviews, three have no star line, and the cards disagree on wattage, class, and what is in the box. Peter F. used the listing files read on 20 October 2026, plus the UK review notes in those files. There was no lab test. A qualifying amazon.co.uk purchase can earn a commission at no extra cost to you. The full rows are on the [80 litre hot water cylinder comparison](/hub/hot-water/80-litre-hot-water-cylinder).

You already want an 80 litre electric store, and you want a short answer on the best 80 litre hot water cylinder from the five amazon.co.uk listings we kept.

Our top picks

TESY TESY 80 litre BiLight vertical

Best overall

TESY TESY 80 litre BiLight vertical
8.8/10about £234.99
View offer
Eldom Eldom Spectra 80 litre

Best value

Eldom Eldom Spectra 80 litre
8.6/10about £189.00
View offer
TESY TESY BiLight 80 litre Wi-Fi

Rank 3

TESY TESY BiLight 80 litre Wi-Fi
0.0/10about £249.99
View offer
On this page
  1. 1.A thin sample, and two labels
  2. 2.When the Wi-Fi TESY is the one to open
  3. 3.When the plain TESY is the one to open
  4. 4.Who should skip the Eldom and the Thermex

A thin sample, and two labels

None of the five files is a stable sample of this exact 80 litre unit. The plain vertical TESY, B0H3W8GBZ9, is 4.4 from 72 reviews at about £234.99. One review describes a 100 litre unit at about 2.5 kW. The comparison still marks it as the top pick on listing score. The Eldom is 4.3 from 39 at about £189.00, and most written comments are marked Germany. It is best value because the card states 2 kW and a safety valve. The Wi-Fi TESY, the horizontal TESY, and the Thermex have no star line.

When the Wi-Fi TESY is the one to open

Open B0FSL2Z22W if you want part number 306344, which Modern Heat also prints on a TESY BiLight Cloud 80 at about £249.99. The Amazon card says class B, a digital panel, and the MyTesy app. The Amazon card also prints 220 watts, 85 kg, and a depth of 455 m. The retailer page states 2,000 W, with the valve extra. Do not paste the catalogue figure of 2,762 kWh onto 306344. Budget for the valve and the bolts, then use the installation checks.
TESY TESY 80 litre BiLight vertical

Testsieger

TESY TESY 80 litre BiLight vertical
8.8/10about £234.99
View offer

When the plain TESY is the one to open

Open B0H3W8GBZ9 if you want UK review text rather than an app. It is about £234.99, class C, with a heating light rather than MyTesy. The included line says cylinder, and a UK review says no fittings and no cable arrived. The wattage field prints 1,500 kW and the heat-output field prints 65°C. The dimensions print 44 × 50 cm, which is a short height for an 80 litre vertical shell. Because one review names 100 litres, confirm the data plate before the installer starts.

Who should skip the Eldom and the Thermex

Skip the Eldom if the class letter or the app must agree twice. The title says vertical. The dimensions are 82.5 cm wide by 45.7 cm high. Class is C on the attribute line and B in a bullet, and the attribute maximum temperature is 40°C. A safety valve is why it is best value at about £189.00, with those clashes still open. Skip the Thermex if you need reviews: about £177.10, class B, a 3-way valve, and no star line. The horizontal TESY stays off this shortlist unless the ceiling forces that shape. If the volume may be wrong, read the one bathroom page first.

Common questions

Is 4.4 from 72 enough to call a top pick?
The comparison does, on listing score, and the limit stays in the same sentence. Seventy-two amazon.co.uk reviews is the largest sample in this set, and it is under a 100-review floor. At least one review on B0H3W8GBZ9 describes a 100 litre unit at about 2.5 kW, so the file is not only this 80 litre model. The average can tell you that many buyers were broadly satisfied with whatever arrived. It cannot support a failure rate, or a claim that this shell matches the catalogue BiLight 80.
Is the Wi-Fi TESY the same unit Modern Heat lists as 306344?
The Amazon listing file prints part number 306344 and £249.99, which is the same code and shelf price as Modern Heat’s BiLight Cloud 80. That is a useful match. It is not proof that every Amazon field is the retailer specification. The retailer states 2,000 W, 455 mm depth, and 1,303 kWh a year. The Amazon card also prints 220 watts, 85 kg, and 455 m. Read both, then read the data plate. Do not copy the catalogue model’s 2,762 kWh onto this part number.
Why is the Thermex cheaper and still class B on the card?
The Thermex is about £177.10 with class B and 2,000 W stated together, and with a 3-way valve in the box. Class B, for load profile L, is the 50% up to 75% band. The card does not show a star line, a full width and height, or a guaranteed English manual. A lower price plus a better letter is not best value when the customer sample is missing. Best value in this set is the Eldom, which states 2 kW, a safety valve, and a star line.
Should I trust the Eldom app claim?
Only as a bullet. The title says a mechanical thermostat. The bullets say a TFT display, timers, and MyELDOM. Wi-Fi is not on the special-features line. Until the unit in front of you shows the app controls, treat MyELDOM as claimed, not as a feature you can plan a timer around. The same card’s class letter has the same problem: C in the table, B in a bullet. The safety valve is the part of that card that is stated more than once.
Do I need a review sample before I order a heater with no stars?
You need some other check, because a missing star line is not evidence of a quiet success. For the Wi-Fi TESY the other check is part number 306344 on a UK retailer page, plus the data plate when it arrives. For the horizontal TESY and the Thermex there is no equivalent review file in this set. If you cannot accept that, do not order them from these cards. A German review on a different ASIN does not fill the gap.

Related pages

80 litre buying guide

80 litre hot water cylinder

Install an 80 litre electric water heater: the checks

Is 80 litres enough for a shower in one UK bathroom

Vertical or horizontal hot water cylinder: which fits

Sources

Public UK sources named below. amazon.co.uk prices, stars and review counts on these five listings were taken from the listing files read on 20 October 2026. Page updated 21 October 2026.

  1. Approved Document G (2024 amendments) (retrieved 20 October 2026)
  2. Approved Document P (2013) (retrieved 20 October 2026)
  3. HSE hot and cold water (retrieved 20 October 2026)
  4. HSE cylinder checks (retrieved 20 October 2026)
  5. Retained Regulation 812/2013 (retrieved 20 October 2026)
  6. GOV.UK energy labelling of products (retrieved 20 October 2026)
  7. Hot Water Association sizing (retrieved 20 October 2026)
  8. TESY BiLight 80 datasheet (retrieved 20 October 2026)