esse 990ch multifuel range

[deesideforester]

Hi folks I have just ordered one of these after running a bosky 90 for the last 20+ years, it heated the house and domestic hot water and was not the cleanest range cooker so we are changing to an Esse. what I would like to know is how many radiators your esse 990ch is heating is it more than they say or less.

[Alycidon]

As an Esse cooker dealer I am surprised that you have not bounced this one off your local dealer.

 

990CH has a stated heat output to water of 57,000 BTU when burning Anthracite, ( natural smokeless coal). Heat output on wood is as far as I can see not published but is likely to be within 10%, this can be checked with David Randleson at Esse, dial the main number and go option 2.

 

57,000 BTU equates to about 16.7kw. A single rad 600mm tall x 1200mm long will want about 1kw., a double rad of the same size then 2kw and so on. A 120 litre DHW tank will want about 2.6kw. You will have heat losses in the pipework around the system, quite how much depends on pipe size and length of run but on average probably a couple of kw. So to answer your how many rads question is not as straightforward as it appears, assuming 2.6kw for DHW, 2kw for pipework losses that leaves you about 12kw for the rads and another 3kw-5kw radiating off the front of the cooker into the kitchen.

 

https://esse.com/range-cookers/esse-990-ch/

 

A couple of things to be aware of but hopefully your dealer has advised you already.

 

A, The optional Boiler Control Unit ( or similar) should be installed. This optional device installs into the cold water return pipe external of the cooker. It allows the cooker to get up to temperature before allowing cold water into the water jacket around the firebox. In my opinion this is vital as without it you wont be able to use the 990 to cook with until it has heated up all the water in the system. Without it you will also find the firebox running at low temps which will lead to tars being deposited into the cooker flueways and the flue system itself.

 

B, The pull from the flue needs to be from memory around 15PA ( Pascalls) this is about a fair bit higher than that needed from a stove (12PA) as the pull needs to be able to pull the hot flue gases around the cookers internal flueways. So if you need to run it on a 4.5 m flue you will possibly need a wind driven rotary cowl or similar on top of the flue to upgrade the pull.

 

As your current appliance is somewhat similar to the Esse then these last two points are probably academic.

 

PM if needed.

 

A