CookerMax for AGAs

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For home heating oil cookers 

CookerMax has been specially formulated to be used in oil fired vaporising cookers such as AGAs and Rayburns.

BoilerJuice's CookerMax additive slows down the rate of deposit growth and therefore helps to avoid operating problems that can occur between regular services.

These can lose heat or cut out due to deposits forming on critical components. Deposits are formed as fuel oxidises when in contact with hot surfaces for a long period of time.

Many factors impact the growth of deposits – including the standard of maintenance and also fuel quality.

  • Reduces deposit build-up
  • Improves system efficiency
  • Inhibits sludge formation
  • Stabilises the fuel
  • Avoids operating problems
  • For a greener, cleaner burn
  • One bottle treats approx 1000 litres

CookerMax Additive Application Instructions: 

  1. Shake un-opened container well before use.
  2. Unscrew lid and pour the contents of this bottle into the oil tank at the correct dose.
  3. Each 200ml bottle will treat approx 1,000 litres of kerosene.
  4. Bottles do not need to be used all at once, our oil additives have a two year shelf life from date of production (see label on bottle top). Replace cap and store in a cool, dark place away from sources of ignition and out of reach of children and pets.
  5. If the bottle is empty please dispose of the bottle in accordance with your local waste disposal guidelines 
  6. For best mixing add to oil storage tank prior to or during delivery, if delivery has already been made mixing will take place over the course of a few days.

Please note: Some tanker drivers may be willing to apply your additives for you when your oil is delivered, unfortunately not all of our companies are able to do this due to internal health and safety policies. If the driver is unable to apply your additives please wear suitable PPE e.g. safety spectacles and gloves when applying your additives and dispose of your empty bottle in accordance with your local waste disposal guidelines.

Important notice: This product is not recommended for use with pressure-jet cookers.

Frequently Asked Questions

Q: What are the key benefits of the CookerMax additive?
A: CookerMax additive reduces deposit build-up; improves system efficiency; inhibits sludge formation; stabilises the fuel and avoids operating problems.

Q: Will the additives arrive with the oil delivery?
A: Our oil additives are sent to you direct and are usually delivered by Royal Mail. They generally arrive before the oil tanker makes deliverey, but if they don't there is no need to worry. You can easily add them yourself after the oil has been delivered. 

Q: How does the CookerMax  additive work?
A: CookerMax additive has a mixture of anti-oxidants and other stabilisers that slow down fuel oxidation and therefore the rate of deposit formation on critical vaporising CookerMax surfaces.

Q: Can I mix CookerMax  additive with other additives I have already put into my tank?
A: Yes, they will be completely compatible if CookerMax additive is added at the correct dose and the other additives have been designed for use in vaporising boilers.

Q: Will any warranties on my CookerMax and equipment be affected?
A: No, heating oil containing CookerMax additive meets the same Fuel Standard (BS2869C2) as unadditised heating oil and therefore should not impact any warranties.

Q: Will there be any adverse effects using CookerMax additive in very cold or very hot temperatures?
A: No, heating oil treated with CookerMax additive will not be affected by extremes of weather, in fact this fuel will remain fresher for longer in very hot temperatures.

Q: I have read that CookerMax additive works by avoiding deposits and operating problems that can occur, but does the treated fuel also instantaneously burn better in an existing clean system or have a higher energy content (e.g. calorific value)?
A: No, heating oil treated with CookerMax additive has the same energy content as regular heating oil. It works by avoiding fuel degradation, deposits and other operating problems that routinely occur with systems operating overall several weeks. Instantaneous combustion improvers often have side effects that can cause damage to your boiler. CookerMax additive does not contain them.

Q: Will CookerMax  additive be compatible with my boiler and do I need to consult my boiler engineer or boiler manufacturer first?
A: Heating oil treated with CookerMax additive meets the same BS 2869C2 specification and is therefore compatible with your boiler if you are currently using regular heating oil (kerosene). You do not need to consult your boiler manufacturer or heating engineer prior to use.

Q: The CookerMax bottle does not seem quite full, how much should be in the bottle?
A: There is 200ml of additive in the bottle, but a space is left at the top to avoid "glugging" or spills while pouring in the contents into the oil tank.

Q: Can I extend my boiler service intervals if I use CookerMax additive?
A: No we recommend vaporising boilers are serviced according to the manufacturers schedule e.g. every 6 months. Your engineer may notice lower levels of deposits after the heating oil has been dosed with CookerMax additive.

Q: How long does it take for CookerMax additive to start providing the benefits?
A: The time taken for a fuel correctly dosed with CookerMax additive to start making a difference depends upon the weather conditions and fuel consumed. In most cases it will start to work in just a few weeks. Each 200ml CookerMax additive bottle will treat approx 1000 litres of fuel. In most cases, there should be enough additive in the bottle to treat the existing fuel in the tank; if not, the full benefits of CookerMax will not be present until used again at the next tank fill. 

Q: Many technical folks believe in-service problems are dictated by a fuel’s Char Value (IP 10 Method). Does using CookerMax additive lower the Char Value?
A: Although some in-service problems have been attributed to high Char Values, we believe that the results from this test are highly variable and there is only a weak correlation with real world performance. The standard of boiler servicing is one of the key factors. Yes, fuel treated with CookerMax additive does generally have a lower Char Value than untreated heating oil.

Q: Where can I read more about BoilerJuice's range of additives?
A: Read more about BoilerJuice's range of additives.

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