Contact us for Prices. Delivery All over UK and Ireland. Great Pallet Rates for Full Bathrooms delivered to your door 02886751049 ROI:-  01-4979103



Warmflow US70HE Utility Condensing Oil Boiler 15-21 Kw (This is A System Not a Combi) Ex VAT £974.45 Rebranded New Name is Agentis Internal 21 I21S

Regular price £1,169.34

Rebranded New Name is Agentis Internal 21 I21S

Output: 15-21Kw

The Warmflow Agentis U-SERIES Utility Condensing System Oil Boiler 15-21kW has been specifically designed to fit into the most common kitchen and utility room applications. Supplied as a pre-pumped boiler with a system kit, the Warmflow U-SERIES Utility Condensing System Oil Boiler 15-21kW includes a 12 litre expansion vessel that can hold a total system volume of 145 litres.
A stylish, high-gloss white casing, proven Riello burner technology, and a 7 year heat exchanger warranty are just some of the incredible features of this boiler.

Why Buy A Warmflow Boiler?

  • Warmflow are a Northern Irish/British company, with the largest market share of oil boilers in the UK
  • Fitted with a Riello burner - the world leader in burner technology
  • Full back-up service covering the whole of England, Scotland, and Wales
  • Flue diameter - 125mm
  • The most versatile flue system on the market - plastic flue system with inbuilt temperature control for total safety
  • Each boiler is produced in a brand new £2.5 million pound fully robotic manufacturing plant, ensuring 100% reliability and customer satisfaction

Please note: This is not a combination Boiler. Please call 02886751049 if you need assistance.

Warmflow Agentis U-SERIES I21S Oil Boiler Features:


  • Easily-accessible, highly-efficient heat exchanger
  • Latest in Riello burner technology for complete reliability
  • Extremely quiet in operation
  • Finished in a stylish, high-gloss white casing
  • Designed to fit neatly under standard size work surfaces
  • Supplied for balanced flue applications
  • Suitable for use with Warmflow high efficiency 'easy-fit' flue systems
  • Ideal for use with systems designed to operate with a low return water temperature (underfloor heating, for example)
  • Can provide central heating only or central heating & hot water indirectly
  • Economical running costs thanks to SEDBUK A efficiency rating

***Very Important Notes on Delivery (England / Scotland / Wales)***

We Send all Oil Boilers to England Scotland and Wales On a Pallet from our warehouse in Northern Ireland.

Depending where you are based, this will be a 48-72 Hour Delivery by Lorry on a Boat over the Irish Sea.

We Cannot Guarantee Delivery times or ETA’s. We can only Save you on Price.

If you can not be at home to receive your goods, or have someone else wait for you, the courier can offer a BOOK IN Delivery Service where the goods come to a City near you. then they call you and arrange a date and time that suits you! but we need to know this when you order. Also it can be a bit slower taking up to 1 week for some deliveries where as not booking if you are home all day gets there in 2-3 days tops! (Weekends not included)

We Also advise not to start any jobs until you have the goods in your possession as we cant predict if the courier will be late but it normally will never be more than 1 day or at the weekend a Friday Delivery will be on a Monday as the hauliers dont deliver at weekends.

Saying all of this is only worse case scenario and, 99% of the time goods will be on time and there wont be any of these problems! but in the past these are questions we have been asked, and this is the downside to ordering online. If you want it immediately online is not for you.

Thank you for Shopping with us and we hope you enjoy the Massive Savings ££

 Warranty will be valid with a returned Boiler Passport.

More product information can be found on the Warmflow Website HERE