Joule Invacyl Slimline Indirect 90–210L Unvented Hot Water Cylinder

Joule Invacyl Slimline Indirect 90–210L Unvented Hot Water Cylinder

The Joule Invacyl Slimline Indirect range (90L, 120L, 150L, 180L, 210L) is the ideal solution for delivering powerful hot water to homes with space restrictions. With a reduced outside diameter—approximately 475mm—these cylinders fit tight cupboards and plant rooms while offering full, mains-pressure performance. Built from premium Duplex stainless steel and featuring Joule’s high-efficiency indirect coil, each cylinder delivers fast recovery, long-term reliability, and exceptional heat retention.

Key Features:

• Slimline design for installation in narrow cupboards—only about 475mm diameter
• Indirect model: heated via high-efficiency coil from gas or oil boiler (or compatible heat source)
• Factory-fitted electric immersion backup (typically 3kW) for guaranteed hot water, even when the boiler is off
• Main pressure performance: powerful flow for multiple taps and showers simultaneously
• Premium Duplex stainless steel: superior corrosion resistance and longevity even in hard water areas
• High-density PU foam insulation for excellent heat retention (CFC/HCFC-free, environmentally friendly)
• Smooth tube coil for rapid heat recovery and reduced scaling
• Caleffi safety group and compression fittings supplied as standard for fast, safe installation
• Modern white outer case with grey accents for a clean, high-end look
• 25-year manufacturer warranty (2 years on controls/components)

Technical Specifications (range):

• Capacities: 90L, 120L, 150L, 180L, 210L
• Diameter: ~475mm; Height varies by model (e.g., 120L: ~1205mm; 210L: ~1920mm)
• Weight (empty/full): e.g., 120L: ~26/146kg; 210L: ~47/257kg
• Coil: smooth tube, high-efficiency heat exchanger with large surface area
• Immersion heater: factory-fitted (~3kW, 230V)
• Maximum working pressure: 3.5 bar (with included controls)
• Foam insulation thickness: typically 50mm+

Other Details:

• All plumbing and safety connections easily accessible on the front
• Supplied with expansion vessel, T&P valve, and tundish
• Full installation guide and WRAS-certified components
• Suits new build and retrofit; compatible with all conventional/system boilers

Why Choose Joule Invacyl Slimline Indirect?

Choose the Joule Invacyl Slimline Indirect cylinder for maximum efficiency and flow—where fitting a standard cylinder is not an option. Benefit from robust stainless steel build, rapid coil heat-up, and simple installation, all in a UK-certified product with generous warranty cover.

Please note: Delivery times may vary depending on location, with specific details outlined below.

Standard Delivery

UK Mainland 

• Delivery Time: 2–4 working days
• Free Delivery on all orders

Express Delivery

UK Mainland

• Delivery Time: 1–3 working days
• Delivery fee of £15

Channel Islands

• Postcodes Covered: GY*, IM*, JE* 
• Minimum Order: £50
• Delivery Fee: £70

Northern Ireland, Offshore Territories & Scottish Islands 

• Postcodes Covered: BT*, HS*, KW, ZE
• Minimum Order: £50
• Delivery Fee: £35

Same Day Delivery 

• Eligible Postcodes:
  E*, EC*, N*, NW*, SE*, SW*, W*, WC*, HA*, UB*, EN*, IG*, RM*, KT*, SM*, CR*, BR*, DA*, TW*
• Minimum Order: £50
• Same Day Delivery Fee: £60
• Special Requests or Locations:
  For areas outside these postcodes or urgent quotes, please email orders@qualityheating.co.uk and we’ll do our best to accommodate.

Collections

Want to collect your order instead?You’re welcome to do so — just email us at orders@qualityheating.co.uk or message us via WhatsApp with your preferred collection time, and we’ll confirm the details.

Collection address: 284 Water Rd, Unit 9, London, HA0 1HX