How we're operating during the COVID-19 pandemic

Find out more How we’re operating during COVID-19
  • Get the best quotes, fast!
  • Over 5,000 engineers across the UK
  • Gas Safe registered engineers

Need a New Boiler?

Get FREE no-obligation quotes now!

  • No delays! Get quotes today
  • Compare quotes & get the best prices
  • Gas Safe & OFTEC registered engineers
 4.8 stars

1,269 reviews

 4.8 stars

1,269 reviews

Mistral Sealed System Non-Condensing S4 41kW Oil Boiler

Mistral Sealed System Non-Condensing S4 41kW Oil Boiler Boiler
Typical Price (inc VAT)
£1,680
Typical installation Cost (inc VAT)*
£1000 - £1500
Sundries (Filter, Flue, etc)
£300
Total Cost
£2,980 - £3,480

Get a quote to install this boiler

Need a repair instead? Get a repair quote
Make Mistral
Model Sealed System Non-Condensing S4 41kW Oil Boiler
Is Condensing Non-Condensing
Efficiency Rating 87%
Band Rating B Rated
LPG Compatible No
Standard Warranty 2 yr. parts - 5 yr. heat exch
Central Heating Max. Output 41kW
Mounting Floor Standing
Flow Rate N/A
Typical Price (inc VAT) £1,680
Typical installation Cost (inc VAT)* £1000 - £1500
Sundries (Filter, Flue, etc) £300
Total Cost £2,980 - £3,480
ERP Rating B Heat

* This is a guide price for a straightforward, like-for-like boiler replacement. Installation costs will vary dependent on work required.

Get a quote to install this boiler

Need a repair instead? Get a repair quote
Product Description

The Sealed System S4 is a highly reliable non-condensing, floor-standing oil boiler that’s been designed and manufactured by Mistral. This is a highly efficient boiler, boasting an A rating and efficiency rating of 93%. It also comes with a high output rating of 41kW, perfectly suited to larger homes with multiple bathrooms and a high demand for heating and hot water.

This is an extremely compact unit, measuring at just 410mm wide, which helps to save you space in your home. Housed in a high-quality white casing, the S4 features a pre-installed water heating sealed system, a circulating pump, 12 litre expansion vessel, safety valve, pressure gauge, automatic air vent, multi-directional flue outlets, pre-punched pipe entry points that are located on both the sides and back that allow for an easy installation that can help save you both time and money. Also included is a 2 or 4 port option and front servicing, conventional or balanced flue option and, finally, it can be used in tandem operations. All of these make for a highly reliable unit you can be sure will not let you down.

With these options being that it is available as a condensing or non condensing boiler. It is available as an indoor or outdoor unit. As well as coming with a wide range of different outputs ratings with these ranging from a 15kW to a 41kW. So you can be sure there's an unit that will suit you.

As this is a System boiler, it directly heats your central heating system and hot water for a storage cylinder. Most of the important parts of the hot water and heating system, such as the pump and expansion vessel, are built into the unit itself, making for a quicker and cleaner installation. This also means that you get a faster response to demand for heating and hot water. Plus, you don't need to have a feed and expansion tank in the loft.

Backed by the Mistral guarantee of quality, it comes with a 5-year warranty so you can be sure you'll be well covered after the installation.

Get a quote to install this boiler

Need a repair instead? Get a repair quote

Get a quote to install this boiler

Need a repair instead? Get a repair quote

Need a new boiler?

Get FREE no-obligation quotes now!

Excellent 4.8 out of 5

Find approved boiler engineers
in your area.

Begin your search by entering your postcode below.

Or select your region from the list and start your search