Commercial hot water cylinders are designed to satisfy substantial or continuous hot water demands such as hotels, care homes, schools, hospitals, camp sites, sports centres, residential or office blocks, when there’s a frequent requirement for large quantities of domestic hot water, in a short period of time, without any performance losses, when staff, residents or visitors create demand for warm water.
Our commercial hot water cylinders, tanks or commercial calorifiers as they are also known, provide a solution for large scale commercial hot water capacity, with fast flow rates that satisfy even the toughest of demand requirements.
Commercial cylinders for commercial water heating
Commercial cylinders come in various options and can use various technology, such as solar (renewable heat energy), electricity, heat pumps or warm water thermal systems (again a renewable heat energy source) to power the water cylinder. The two leading hot water cylinder water heating solutions or options are-
Indirect – indirect commercial cylinders / calorifiers
These are a storage commercial hot water cylinder, that are often powered by a traditional heating boiler that supplies the system, via a coil (which can be a single or double coil) or even a plate-to-plate heat exchanger for high warm water capacity solutions.
The cylinders, tanks or vessels storage capacity can be from 200 litres up to 6,000 litres in system capacity, (any cylinders under 200 litres we classify as domestic sizes – but there is no hard and fast rule on this) although bespoke designed models can be produced to support any larger specific requirements you may have.
Factors such as available installation space, may come into consideration and it is possible to link up several smaller cylinders or buffer vessels to meet the required storage capacity
Our indirect commercial hot water cylinder range can be fitted with electrical immersion heaters, as a back up to your primary heating energy source such as a boiler, thus direct heating of the water.
Direct – Direct commercial cylinders or Calorifiers
A direct commercial hot water cylinder is a unit that uses a heat or energy source that is physically located within the cylinder, normally this is an electric immersion heater or multiple immersion heaters, to warm the water – thus the term “direct water cylinder”. Normally the require three phase electric power rather than single phase supply service, as any immersion heater over 3kW requires a three-phase power supply. The immersion heaters have a control thermostat, that allows you to set your desired temperature.
Often used in in premises or a property where there is no access to gas or oil, or more commonly with businesses or individuals who are using a renewable electric supply or buying electric that is produced by certified renewable sources – enabling them to have a carbon neutral heated system.
We have a dedicated webpage on our direct commercial cylinders on our website here –
Materials of construction of hot water commercial cylinders
There are two main options for the construction of the vessels themselves – being
Vitreous enamelled coated steel vessels
Vitreous enamel protects materials from corrosion. Due to its ability to interact molecularly with the steel surface of the tank, it can store DHW at the highest temperature of 95 ºC without breaking down or coming off from the steel surface of the tank. All internal linings in DHW cylinders must, by law, be “food grade” (EC Regulation 1935/2004). Our vitreous enamel has food grade certification at the specified test temperature according to current regulations at 120ºC, which guarantees its maximum quality at extreme working temperatures, and is suitable and approved for potable water use.
Ultimately vitreous enamelling is a food-grade, impermeable coating with a porcelain appearance that protects the storage tank’s metal surface when it comes into contact with domestic water.
The range has evolved to the point that enamelled lined commercial cylinders now have the same working pressure of 8 Bar or even 10 Bar pressure (at special request) as their suitable stainless steel equivalents, but at reduced costs.
The other benefits are that they are more cost effective than a stainless steel vessels / water cylinder or buffer vessels range. The warranty period on this range is 5 years.
Technical details of the hot water heaters
Continuous hot water flow rates at various input temperatures for 10C to 45C
Continuous hot water flow rates at various input temperatures from 10C to 60C
Cathodic protection should be installed in all DHW tanks composed of carbon steel with an inner lining to DIN 4753. A cathodic protection system consisting of sacrificial magnesium anodes and an anode charge metre is included as standard with this tank series.
Cathodic protection systems with sacrificial anodes must be monitored for wear on a regular basis and replaced, if necessary. You can upgrade to the special electrically powered titanium anodes that emit the necessary current for protection of the tank lining which means that, unlike sacrificial anodes, there is no wear and the anodes do not need to be replaced.
Industrial Hot Water cylinders – from 1,500 to 6,000 Litres
Details on the 1,500 litre to 6,000 Litre Industrial hot water cylinders / Water heaters
Stainless steel cylinders
This material has become popular over the years, as stainless Steel has a much higher resistance to all forms of corrosion, including stress and crevice, making it highly durable and promising a longer working lifespan of the commercial cylinder.
Stainless Steel also can withstand extremely high pressure, which has paved the way for the unvented hot water cylinders that we see today. Unvented commercial cylinders have grown in demand due to their delivery of mains pressure hot water services.
These two factors have made this high-quality material the perfect solution for pressurised domestic water heating services.
We also do a range of stainless steel buffer vessels too- Buffer vessels are used to store hot water either hot water for heating or how water for domestic hot water use -these are detailed on our dedicated buffer vessel webpage – look for the stainless steel options
Commercial unvented hot water cylinders
Unvented cylinders – provide mains pressure water directly from the cold-water mains. The cold water is directly drawn from the mains water supply, then heated by the relevant heat source that you supply to the commercial cylinders
When using electric as your fuel to power the water cylinder they are referred to as – direct commercial cylinders unvented.
Or when powered by boilers which can be either gas or oil boilers, or even heat pumps these days – they are referred to as an indirect commercial cylinders unvented.
Benefits of an unvented hot water system for commercial premises
• Maintain strong pressure thanks to direct mains supply
• No cold-water feed and expansion tank (also referred to as the header tank) at high level – that would give the system pressure, is required
• Thus, an unvented cylinder doesn’t rely on gravity fill and be fitted in any location
• Enhanced hygiene quality and safety – a sealed system not only eliminates the risk of leaks or freezing of the header tank in colder conditions, also contamination of the tank is also removed.
Fast recovery commercial hot water cylinder?
We often get asked what are the fastest recovering commercial cylinders – and the answer is – Our tank in tank commercial hot water cylinder range -which are ideal for a property or premises with high demands.
We have some of the best commercial hot water cylinder’s on the market, all designed to the highest quality standards, and with all the relevant safety features. All of our commercial hot water cylinder is approved to the PED (Pressure Equipment Directive) and the approved Energy Related Products (ERP) Directive 2009/125/CE, where applicable.
Should you interest and require any more support, free design or selection advice or costs/ get a quote on our commercial hot water cylinder range then please use the contact us form page on the website, or feel free to give us a call on 01202 822221, as we sell direct to the trade and public.