200 Litre Direct Unvented Cylinder Water Heater
200 Litre direct unvented cylinder – Electric water heater
Looking for a 200 litre direct unvented cylinder or 210 litre direct unvented cylinder in duplex stainless steel ? then we have you covered as we supply a 215 litre direct unvented cylinder which covers these direct models hot water capacity.
Manufactured in the UK, with quality manufacturing processes,our 200 litre direct unvented cylinder full conforms to the “G3” unvented cylinder building regulations , having WRAS, NSF WRC, CE and KIWA independent approvals.
This 200L direct unvented cylinder is a twin immersion cylinder, with 2 x 3kW immersion heaters fitted as standard to this direct unvented hot water cylinder.
Our 200 Litre unvented direct cylinder offers mains pressure hot water powered by electricity directly, rather than using a gas boiler or oil boiler to power the unit like in an indirect unvented cylinder type.
These 200 litre direct unvented cylinders come with a 25 year warranty for the corrosion-resistant duplex stainless cylinder when used in domestic hot water heating applications.
Our 200L unvented direct cylinder will provide a plentiful supply of hot water for your bathroom or showers at mains water pressure.No additional pump is normally required for the hot water system with a direct unvented cylinder.
This competitively priced cylinder is made with quality manufacturing processes in the UK and has high flow rates for cold water mains pressure water heating.
These 215 Litre direct unvented cylinders (which cover 200 or 210 Litres models) are generally suitable for a 3 Bedroom property with 2 Baths/Showers.
No external expansion vessel is required
This 200 litre direct unvented cylinder has a patented internal hot water expansion system which eliminates the need for an external expansion vessel by using a venturi valve to maintain an air pocket within the direct unvented stainless steel cylinder.
This unvented system ensures a long product life and performance for the direct unvented cylinder because it has no moving parts, which reduces installation, running and lifetime costs for this 200 litre direct cylinder made with quality manufacturing standards and processes.

Our internal air gap and venturi valve system used on our direct unvented hot water cylinders- no external expansion vessel is required and little to no maintenance is required for this competitively priced cylinder / unvented hot water system.
Stainless steel direct unvented cylinder – 200 Litre
Our 200 litres direct unvented cylinder is manufactured in stainless steel, duplex stainless steel to be exact. This duplex stainless steel is known for its excellent strength, exceptional resistance to stress corrosion, cracking and pitting, making it suitable for demanding water heating conditions.
Stainless steel tanks or cylinders are also suitable for installing in soft water areas as well as hard water areas. Glass lined mild steel tanks should not be used in naturally soft water areas, as this type of unvented cylinder can experience significant and rapid corrosion to the product.
Technicnal specification – 200 litre direct hot water cylinder (210 &215 Litres as well)
Our 200 litre direct unvented hot water cylinder has the following dimensions (yes our unit is 215 Litres of storage – so also covers the 210 litre direct unvented cylinder requirements)

Unvented direct hot water cylinders – Dimensions drawing for 80 Litre to 500 Litre models
Our 200 litre hot water cylinder dimensions are as follows

200 Litre direct unvented cylinder – it’s actual 215 Litres of volume – so covers the 210 direct unvented cylinder requirement as well.
Hot water heat-up time and recovery rates for our direct unvented cylinder, 215 litres in capacity
As standard, our 215 litre direct-pressurised hot water cylinders in high-grade stainless steel are fitted with 2 x 3kW immersion heaters with proven technology and quality.Following are the hot water heat up times.

Water heating and recovery times in minutes for our 200 litre unvented direct cylinder with the standard 2 x 3kW immersion heaters.
We also do the unit with 3 immersion heaters (3 x 3kW) or can upgrade the power output of these immersions to 6kW each – giving a total kW output possible of 18kW for this size hot water cylinder. This affects the above times accordingly.
The full brochure and installation manuals are here –
Download the Hot water cylinders direct and indirect unvented brochure from Flexiheat UK
Download the installation & technical manual for our direct and indirect hot water cylinders
Should you require a different volume direct unvented hot water heater, we have a full range from 80 Litres to 500 litres in capacity, which are detailed on this webpage – 80 to 500 Litre direct unvented cylinders.
200 Litre direct cylinder standard components
Our 200 litre direct unvented cylinder models come complete with the following supplied accessories to suit the product –
2 x 3kW Incoloy immersion heaters including control and cut out thermostats as standard with our dual immersion cylinder.
Option of 3 x 3kW immersion heaters – making this 215L direct cylinder a triple immersion heater cylinder – we can actual fit 3 x 6kW immersion heaters to this unit if so required.
22mm Cold water inlet pressure reducing valve /expansion relief in a combination valve for high flow rates
22mm Hot water outlet, again for high flow rates
Our 200L unvented direct cylinders are fitted with a secondary DHW return connection as standard.
Dual thermostat (control thermostat and energy cut out thermostat)
Tundish
Pressure and temperature relief valve mounted to the direct unvented cylinder.
200 litre direct unvented cylinder installation
All direct unvented cylinders must be fitted by a plumber or heating engineer with “G3” unvented qualifications; this certification ensures the necessary knowledge and skills to install and maintain unvented hot water storage systems. In the UK, building control will not issue a building regs certificate unless a qualified person has fitted the unit.
To locate a G3 qualified heating engineer close to you, please consider using this website – gas safe register
Contact Flexiheat UK
For further information or more details, check stock availability, lead time, delivery, prices or to purchase our 200 litre direct unvented cylinder, as we sell direct our competitively priced cylinder, which is made in the United Kingdom from duplex stainless steel with quality manufacturing methods and a manufacturer 25 year warranty (for domestic use). Please contact our sales team on 01202 822221 or use our site email contact form.