The best 50 litre hot water cylinders, compared.
Top pick: Eldom Favourite 50 litre Wi-Fi – Highest score at 86: class B, 2 kW at 230 V, a safety valve in the box, and 4.6 from 12 ratings, if you can ignore the app. Best value: TESY BiLight 50 litre horizontal – Lowest price at about £159.99, on a different listing, and the only one that states class C, profile M and 1,418 kWh a year. Updated October 2026.
You buy this size for a studio, a one-person flat, a static caravan or a single shower, where a 1.5 kW or 2 kW element reheats the tank between uses. The Hot Water rule of thumb is 35–45 litres stored per person, and a bath is about 100 litres at 40 °C, so 50 litres is a short shower one person. A bath needs a larger store, such as an [80 litre hot water cylinder](/hub/hot-water/80-litre-hot-water-cylinder). The page has no star line, and the fixing bolts are not in the box. A 50 litre hot water cylinder is a wall-hung electric storage heater. An element, a thermostat, insulation and a wall bracket heat and hold about 50 litres. It is not an electric shower, which has no 50 litre store. Indirect cylinders heated by a boiler coil are a different purchase. BS EN 12897 covers indirectly heated unvented stores. Fifty litres is a short shower for one person who can wait to reheat. It is the wrong store for a bath, or for two showers back to back. What to measure before you choose orientation, watts and box contents is set out in the [50 litre cylinder buying guide](/hub/hot-water/50-litre-hot-water-cylinder/sub/50-litre-hot-water-cylinder-buying-guide).
You buy this size for a studio, a one-person flat, a static caravan or a single shower, where a 1.5 kW or 2 kW element reheats the tank between uses.
14 products checked · 57 hrs invested · +16,800 readers
Swipe for more
1-2 of 4
Personal buying guide
Question 1 of 2
How does the tank have to sit?
The Eldom Favourite listing is a 50 litre, 2 kW, 230 V wall store at about £189.35 with energy class B and a safety valve in the box. It scores 86, the highest in this set, and the amazon.co.uk line is 4.6 out of 5 from 12 ratings. The table size is 38.7 cm wide by 76 cm high, with a depth of 410 mm and an empty weight of 18 kg. The title says electronic control and Wi-Fi. Written reviews marked as reviewed in Germany say the My Eldom app can run it and that the panel also works without the app. Several say the paper manual did not get the Wi-Fi connected. Wall plugs and screws are not in the components line. There is no UK annual kWh figure next to the class B letter. It will not fill a bath.
Pros
Cons
Best for: A one-person electric store where you want class B, a stated safety valve and app control, and you can follow the Wi-Fi steps or ignore the app.
Less suitable: Anyone who needs UK-written reviews, supplied wall fixings, or a tank that will fill a bath.
Specifications
Common questions
Is the listed capacity 50 litres?
Yes. The amazon.co.uk capacity line says 50 litres, and the title says 50 litres. The table size is 38.7 cm wide by 76 cm high, with a depth of 410 mm and an empty weight of 18 kg.
Does it include a safety valve?
Yes. Included components are listed as an inlet and safety valve, and the special-features cell says pressure release valve. Wall plugs and screws are not in that components line. One review says the buyer had to get two plugs and screws.
Can you control it from a phone?
The title says electronic control and Wi-Fi. Written reviews, all marked as reviewed in Germany, say the My Eldom app can run it and that the panel also works without the app. Several say the paper manual did not get the Wi-Fi connected.
The Eldom Spectra listing is a vertical 50 litre store at about £175.00. It scores 78. The title says 1.5 kW and 230 V, energy class C, and the review line is 4.2 out of 5 from 18 ratings, including UK reviews that say it runs and fits a kitchen cupboard. The table size is 45.7 cm wide by 59.5 cm high, depth 457 mm, empty weight 17 kg. The specification table also prints a wattage, a heat output and a maximum temperature that do not match the title. Those cells are not the rating to plan from. Pressure is printed as both 7 bar and 8 bar. The box lists a pressure reservoir and a 3-way inlet valve, not wall screws. A Netherlands review says connection material and screws were not included.
Pros
Cons
Best for: A cupboard that can take a vertical tank, if you treat 1.5 kW in the title as the figure to check with the installer and ignore the conflicting cells.
Less suitable: Anyone who needs the specification table to agree with itself, or a Wi-Fi model.
Specifications
Common questions
Is it a vertical 50 litre heater?
Yes. The title says Eldom Spectra 50 litre, vertical mount. The capacity cell is 50 litres. The table size is 45.7 cm wide by 59.5 cm high, depth 457 mm, empty weight 17 kg.
What power should you plan for?
The title and the bullets say 1.5 kW at 230 V. The wattage cell and the heat-output cell do not match that title. A UK review describes it as roughly a 1.5 kW heater. Plan from the title, and check it with the installer.
What is in the box?
The included-components line says a pressure reservoir and a 3-way inlet valve. It does not list wall screws. A Netherlands review says connection material and screws were not included.
The GEESEN GK050 listing is a 50 litre, 2 kW, 240 V store at about £219.00, the highest price in this set. It scores 62. A safety valve, a drip pipe and screws are in the box, and the review line is 3.5 out of 5 from 17 ratings. The title says UK plug, while the components list an American NTP 1/2 adapter. That plug line is not proof of UK pipe fittings. The maximum-temperature cell is 55 °C, below the 60 °C storage figure from the HSE. The efficiency cell is A with no annual kWh. Empty weight is 14.9 kg and the table size is 30 cm wide by 60 cm high. Depth is not given. UK texts say it got hot, that a thermometer was missing, and that the body is round so the wall has to be planned. One UK text is about a damaged 32 litre unit and is not evidence for this tank.
Pros
Cons
Best for: A compact point-of-use tank where the screws and safety valve matter and you can sort the pipe thread before you fit it.
Less suitable: A UK bathroom install that assumes a BS 1363 plug and UK compression fittings are already in the box.
Specifications
Common questions
Is the tank 50 litres?
Yes. The title and the capacity cell say 50 litres. The model cell is GK050. Empty weight is 14.9 kg and the table size is 30 cm wide by 60 cm high. Depth is not given.
Does the box include a safety valve and fixings?
Yes. Included components list instructions, a drip pipe, an American NTP 1/2 adapter, a hanging plate, a safety valve and screws. The title says UK plug. The components line does not name a BS 1363 plug, and the adapter is not a UK pipe fitting.
What do the UK reviews say?
The listing line is 3.5 out of 5 from 17 ratings. UK texts say it got hot and drew little power, that a thermometer was missing, and that the body is round so the wall has to be planned. One UK text is about a damaged 32 litre unit and is not evidence for this tank.
The TESY BiLight listing is the lowest price in this set at about £159.99, and it is the only one that states energy class C with load profile M and 1,418 kWh a year. It scores 74. It is horizontal, 1,500 W, and the listing asks for a 16 A fused spur. The wall bracket is included and the fixing bolts are not. Overheat and anti-freeze protection are named. The bullets give a diameter of 353 mm, a width of 803 mm and a depth of 380 mm, while the depth cell says 44.0 cm. The heat-up bullet, 1 hour 18 minutes from 15 °C to 60 °C, and the V40 figure of 78 litres are listing claims, not an independent test. The page has no star line. The voltage cell says 220 V AC.
Pros
Cons
Best for: A single-person slot where the tank has to lie horizontally and you can supply your own wall bolts and a 16 A spur.
Less suitable: A buyer who wants star ratings, a vertical tank, or a valve listed in the box.
Specifications
Common questions
Is it a horizontal 50 litre cylinder?
Yes. The title says TESY BiLight horizontal electric water heater, 50 litres, wall mounted. The capacity cell is 50 litres. The bullets describe it for spaces where a vertical tank will not fit.
Are the wall bolts included?
No. Included components are the heater, instructions and a wall bracket. The same line says fixing bolts are not included.
What energy figures does the listing give?
Efficiency is C. The bullets add load profile M and annual electricity consumption of 1,418 kWh, and they ask for a 16 A fused spur. There is no customer-review line on the listing.
The four scores come from the amazon.co.uk listings kept on this page. They are not a laboratory test. The Eldom Favourite scores 86 and is the top pick. The Eldom Spectra scores 78. The TESY BiLight scores 74 and is best value, as the lowest price with the only stated annual kWh. The GEESEN GK050 scores 62. The weights below are the display criteria for this comparison and sum to 100.
Capacity
8%Every listing kept here states 50 litres. The Hot Water Association's rule of thumb is 35 to 45 litres stored per person, and a bath is about 100 litres at 40 °C, so this size is a short shower for one person.
Orientation
12%TESY BiLight is horizontal. The Eldom Spectra title says vertical. The Favourite and the GEESEN do not state orientation, so you measure the table size against the cupboard.
Listed power
14%Titles say 1.5 kW or 2 kW. The Favourite and the GEESEN agree at 2 kW. TESY agrees at 1,500 W and asks for a 16 A fused spur. The Spectra title says 1.5 kW. Cells on that page that fight the title are not the rating.
Energy class
14%Only TESY states class C with load profile M and 1,418 kWh a year. The Favourite states class B with no annual kWh. The Spectra states class C. The GEESEN states class A with no kWh or profile.
Maximum temperature
8%The Health and Safety Executive says store at 60 °C. The Favourite cell is 75 °C and the TESY cell is 65 °C. The GEESEN cell is 55 °C. The Spectra temperature cell conflicts with the title, so it is not used as the rating.
Safety devices
12%A safety valve the listing actually names scores here. The Favourite and the GEESEN name a valve. The Spectra names a 3-way inlet valve. TESY names overheat and anti-freeze protection and does not name a valve in the box.
In the box
12%The Favourite includes an inlet and safety valve, not wall plugs. Spectra includes a 3-way inlet valve, not screws. TESY includes a bracket and not the bolts. GEESEN includes a valve, screws and an NTP 1/2 adapter.
Wi-Fi
4%Only the Eldom Favourite title says Wi-Fi. Written reviews say the panel also works without the app, and several describe a difficult pairing. The other three listings do not state Wi-Fi.
Customer rating
8%Stars are the amazon.co.uk line. Favourite is 4.6 from 12, with written reviews from Germany. Spectra is 4.2 from 18, with UK texts. GEESEN is 3.5 from 17. TESY has no review line.
Price
8%Shelf prices on these four listings run from £159.99 to £219.00. TESY is the lowest. Spectra is £175.00. The Favourite is £189.35. GEESEN is £219.00. A 3 kW store seen at £478.95 was not kept.
Match the tank to one person, the shape of the cupboard, and the parts the listing actually includes. A class letter without annual kWh is weaker than a full energy line, and a bath is the wrong job for 50 litres.
A 50 litre hot water cylinder in this comparison is a wall-hung electric storage heater. An element, a thermostat, insulation and a wall bracket heat and hold about 50 litres. It is not a café urn. A drinks boiler marked 50L/H means litres per hour, not a stored volume. It is not an electric shower, which has no 50 litre store. Indirect cylinders heated by a boiler coil are a different purchase. BS EN 12897 covers indirectly heated unvented stores.
On a drinks boiler, 50L/H means litres per hour. The four listings here are stored volume of about 50 litres. The TESY V40 figure of 78 litres is mixed water at 40 °C, not extra capacity in the tank.
The Eldom Spectra title says 1.5 kW. Other cells on that page do not match the title. Do not plan the circuit from those cells. A UK review describes the heater as roughly 1.5 kW. Check the figure with the installer.
A bath is about 100 litres at 40 °C. The Hot Water Association’s rule of thumb is 35–45 litres stored per person, and about 18 litres a minute at 40 °C for a decent shower. Fifty litres is one short shower, then a wait while the element recovers the tank.
The carton decides the first hour of the install. The Eldom Favourite includes an inlet and safety valve, and the components line does not list wall plugs. The Eldom Spectra includes a 3-way inlet valve, and screws are not listed. A Netherlands review on that listing says connection material and screws were missing. The TESY BiLight includes a wall bracket and not the bolts, and it does not name a safety valve. It asks for a 16 A fused spur, and the voltage cell says 220 V AC.
Only the TESY states a class, a load profile and an annual figure together: class C, profile M and 1,418 kWh a year. The Eldom Favourite states class B and no annual kWh. The Eldom Spectra states class C. The GEESEN states class A with no kWh or profile. A lone letter in an Amazon cell is weak evidence, especially where another cell on the same page disagrees with the title. Stars are the amazon.co.uk line, and the country of the written text matters.
Three typical situations, each with a recommendation from this comparison.
You can wait to reheat and you do not take a bath. The Eldom Favourite is the top pick: class B, 2 kW at 230 V, and a safety valve in the box. The written reviews are from Germany, and the Wi-Fi steps are the usual complaint. The panel also works without the app, according to one of those reviews.
The tank has to lie flat. The TESY BiLight is the only horizontal listing here, at about £159.99, and it is the best value. It states class C, profile M and 1,418 kWh a year, and it asks for a 16 A fused spur. The bracket is included. The bolts are not, and there is no star line.
You are replacing an upright 50 litre tank and you want United Kingdom review texts. The Eldom Spectra title says vertical, 1.5 kW and 230 V, at about £175, with 4.2 from 18 ratings. Treat the title as the power to check with the installer. The specification table does not agree with itself.
The top pick is the Eldom Favourite at about £189.35. It scores 86, the highest here: 2 kW and 230 V agree across the title and the cells, energy class B is stated, a safety valve is in the box, and the star line is 4.6 from 12 ratings. The written reviews are from Germany, and Wi-Fi pairing is a repeated complaint. Best value is the TESY BiLight at about £159.99, a different listing and the lowest price, with class C, load profile M and 1,418 kWh a year stated. It has no star line, and the bolts are not included. Skip the Favourite if you need UK-written reviews. Skip the TESY if you need a vertical tank or a safety valve named in the box.
Eldom Favourite 50 litre Wi-Fi
Highest score at 86: class B, 2 kW at 230 V, a safety valve in the box, and 4.6 from 12 ratings, if you can ignore the app.
TESY BiLight 50 litre horizontal
Lowest price at about £159.99, on a different listing, and the only one that states class C, profile M and 1,418 kWh a year.
Editorial
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Guides on what to look for, how to use a product, and common mistakes.
Public UK sources named below, as used for this comparison. amazon.co.uk prices, stars and review counts are the figures on the four listings in the product data. Page updated 21 October 2026.
This page contains affiliate links to amazon.co.uk (tag pcuk26-21). If you buy through them, we may earn a commission at no extra cost to you. Prices, stars and review counts are taken from those listings. We did not run a lab test.
