DOMESTIC HOT WATER TANK
A domestic hot water tank (also known as a hot water cylinder or storage tank) is an insulated vessel that stores a reservoir of heated water for household use . Unlike a "combi boiler" that heats water on demand, a tank allows you to have a large volume of hot water ready for multiple uses at once, like filling a bath or running a shower . Here is a breakdown of the main types and considerations.
Available models: 200Liter 300Liter 500Liter and more
Optional materials: SUS304-2B SUS316 SUS2205
Certificates: ERP The Water Directive PED report
1.Direct vs. Indirect Systems
This refers to how the water in the tank is heated
|
Feature |
Direct Cylinder |
Indirect Cylinder |
|
How it heats |
Has an internal electric heating element (like an immersion heater) to heat the water directly inside the tank |
Uses an external heat source, like a gas/oil boiler or solar panels. Heated water from this source passes through a heat exchanger (a coil) inside the tank to warm the stored water |
|
Key Advantage |
Simpler system, often used as a backup heating method |
More efficient and versatile. Can be integrated with various energy sources, including renewable systems |
2.Vented vs. Unvented Systems
This describes how water is supplied to the tank .
Unvented Cylinders: Connected directly to the mains water supply, providing strong, high-pressure water flow. They don't require a separate cold-water tank in the loft, which saves space .
Vented Cylinders: Supplied with water from a cold-water tank (feeder tank) usually located in the loft. Water flows down by gravity, resulting in lower pressure. These are more suited for older heating systems that can't handle high mains pressure
3.Key Features to Consider
When choosing a tank, you will also see options regarding its construction and heating sources:
Energy Efficiency: Tanks are rated by energy classes (e.g., A, B, C), with Class A offering the best insulation and lowest heat loss . High-quality insulation, like polyurethane foam, is crucial for keeping water hot for longer .
Heat Exchangers (Coils): Tanks may have one or two heat exchangers. A single coil is typically for a boiler, while a second coil allows you to connect an additional renewable source, like solar thermal panels or a heat pump . This makes the system highly versatile .
Tank Material & Protection: Many tanks are made from vitreous enamel-lined steel or stainless steel. They often include sacrificial magnesium anodes to prevent internal corrosion and extend the tank's lifespan .
Sizing: Choosing the right size is important. A typical large family home (5 bedrooms/multiple bathrooms) might need a 300-litre tank or more, while a simple guide is to allow 40-45 litres per person . Tanks commonly range from 200litres to 2000 litres
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