500L Indirect Telford Tempest Vertical Unvented Cylinder + Extra Immersion

500L Indirect Telford Tempest Vertical Unvented Cylinder TSMI300 + EXTRA IMMERSION

The 500L Telford Tempest TSMI500 is a high-capacity indirect vertical unvented hot water cylinder, designed for large residential properties and commercial applications where a dependable, high-volume hot water supply is essential.

With an impressive 500-litre capacity, the TSMI500 is ideal for properties with multiple bathrooms, high occupancy levels or demanding hot water requirements throughout the day. Manufactured from 2304 Duplex Stainless Steel , it delivers exceptional corrosion resistance, long-term durability and rapid hot water recovery when connected to a traditional boiler. The integrated 3kW immersion heater also provides reliable backup hot water whenever required.

Supplied complete with the expansion vessel and installation kit, the TSMI500 includes everything required for a professional installation.

Key Features

• 500 litre indirect vertical unvented cylinder
• Ideal for large homes and commercial applications
• Manufactured from 2304 Duplex Stainless Steel
• Excellent corrosion resistance for a longer service life
• 3 Bar working pressure
• Pressure tested to 15 Bar
• Relief valve operates at 7 Bar / 90–95°C
• High-performance mains pressure hot water
• Fast hot water recovery
• Suitable for traditional boiler systems
• Complete with expansion vessel and installation kit
• Lifetime cylinder warranty*

Supplied Complete With

• Expansion Vessel
• Expansion Vessel Kit
• Dual High Limit Thermostat
• 2 x 3kW Immersion Heater (240V Single Phase)
• Temperature & Pressure Relief Valve
• 3 Bar Inlet Control Group
• Two Port Motorised Valve

Everything required for a standard installation is included.

Why Buy From TDL?

• FREE Delivery (typically 8-12 working days)
• Competitive UK prices
• Expert technical advice before and after your purchase
• Real People. Real Service. For Over 40 Years.

Ideal Applications

The 500L Telford Tempest is well suited to:

• Large luxury homes with multiple bathrooms
• Properties with consistently high hot water demand
• Guest houses and bed & breakfasts
• Small hotels and hospitality venues
• Sports clubs and leisure facilities
• Commercial buildings and office premises
• Light industrial and workplace facilities

Why Choose a 500L Cylinder?

A 500-litre unvented cylinder is the ideal solution where multiple showers, baths and hot water outlets are likely to be used simultaneously. Its large storage capacity helps maintain a reliable supply of mains pressure hot water during peak demand, making it suitable for both residential and commercial environments.

Warranty

• Lifetime warranty on the stainless steel cylinder*
• 2-year warranty on supplied components

The cylinder must be serviced every 12 months by a qualified engineer to maintain the manufacturer's warranty.