What is Ceramic Fibre Insulation?

If you've been through our website, you've probably heard us talk about Ceramic Fibre Blanket for your Aga Range Cooker. What is it? and what does it do?

We LOVE this type of insulation when it comes to Aga Range Cookers. It's a much better insulator than the standard Vermiculite and Rockwool combination, and can help you drive down your monthly running costs. We know some installers are weary of using this inside the traditional Aga Cookers but for us, it's just science! The blankets we use have higher insulating properties than vermiculite and rockwool. The blanket helps your Aga Range Cooker retain heat inside the cast iron components (like a sponge!), and as a result, your cooker uses less energy trying to restore heat that is lost through the back and sides.

Before the uptake of Controllable Electric Models of Aga Range Cookers, we were using this blanket inside our 'always on' 13amp Electric models, which are notorious for their high running costs. We use our own specific method of installing the blanket to ensure minimum (unwanted) heat loss, and higher efficiency.

Refractory Ceramic Fibre Blanket (RCF) is typically made from Aluminium Silicate Fibre, spun and woven into blanket form. It has great insulating properties but can be hazardous to your health. If you've ever been in contact with it, you'll probably have seen the warning symbol above. It comes with a carcinogenic warning, meaning that inhalation may lead to fibrosis, lung cancer and other quite nasty stuff.

Quite a number of years ago, we were substituted a box of RCF instead of our normal Body-Soluble blanket. As soon as I saw the warning, I had to read into it more before using it. I spent a whole evening on my laptop, learning about the different types, their chemical makeup, reading health journals and really became quite obsessive about it all.

As a result, we promptly got rid of the box and made sure that we ALWAYS use non-hazardous insulation. We opt for the bio-soluble versions of Ceramic Fibre Blanket, made from calcium and magnesium silicate fibres. The RCF blankets are much cheaper to buy, and can be bought in bulk from overseas, but we don't think it's worth the risk. We'd rather make sure our engineers and your family are safe from any risk of exposure!

This is another reason why you should look to trust your Aga Range Cooker to a reputable company with your safety being a number 1 priority, instead of the profits from a cheaper (riskier) alternative.

If you're looking to utilise this insulation upgrade for your existing Aga Range Cooker, get in touch with us:

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We're Saltire Cookers.

We specialise in Refurbished Aga Cookers and Electric Aga Conversions to turn older Aga Cookers into efficient, controllable models (without losing the traditional design or radiant heat cooking).

Out of all of our cooker models, the brand new Esse Cookers offer unrivalled cooking experience, and the brand new Everhot Cookers are designed to be 'always on' whilst offering the lowest running costs possible.

We're Saltire Cookers.

We specialise in Refurbished Aga Cookers and Electric Aga Conversions to turn older Aga Cookers into efficient, controllable models (without losing the traditional design or radiant heat cooking).

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Plinths for Aga Cookers

by Steven Johnson • 22 February 2026

Our black steel plinths are available to add onto your cooker order if required. They add additional height to the overall Aga dimensions and are available in multiple heights to suit your kitchen design. Traditionally, these British-made Aga Cookers were 851mm from the base to the top of the black enamelled surface. When do you need a plinth? If your worktop or ideal working height is taller than 851mm and you want your Aga Cooker to match them, you'll need a plinth underneath. Brand new Aga Cookers (as well as our ESSE and Everhot cookers) have a fixed height plinth built into the cooker body. If you need these raised higher, you'll need to lay marine-grade plywood or concrete at the required height before installation. What sizes of plinths are available? Our plinths are available in 50mm to 80mm sizes. They also allow for levelling of the base before the assembly of the cooker begins. How do I choose my plinth size? When choosing your required height, you should consider your finished floor height vs your worktop height. It's standard for Aga Cookers to finish slightly proud of the worktop, since the top plate is curved rather than a right-angle ( photo shown below ). If you were to finish level with the worktop, you will have a bigger 'valley' in-between, where crumbs and debris love to collect! Usually, the plinth is seated onto the subfloor, with finished flooring/tiles ran up to and around the plinth once the cooker is built. Alternatively, you can either seat the plinth directly onto the finished floor/tiles, as long as they can bare the weight of the cooker, or we can raise the plinth using the adjustment legs, to allow the finished floor to tuck underneath slightly ( photo shown below). If choosing this option, you should bare in mind the supporting feet in each corner of the plinth start at around 20mm from the front of the plinth. This means your flooring could run underneath for a depth of around 20mm if preferred. After the cooker is built, there are NO adjustments in height, without a strip down and rebuild. What do Aga Cooker plinths look like?

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