4 to 5kw Small Back Boiler for Multi Fuel / Wood Burning Stoves - Retro Fit
  

4 to 5kw Small Back Boiler for Multi Fuel / Wood Burning Stoves - Retro Fit

£57.99   
   
£48.33 Exc. VAT   |   Inc. 20% VAT|

AVAILABILITY:  

In stock, immediate despatch  

In stock, immediate despatch

Model:  4kwboiler
Brand:  Natural Heating



This is the small water jacket boiler that we often fit to our cast iron stoves. It needs to be fitted inside the stove, above the height of the rear flue outlet and replacing the baffle plate. The boiler will do the same job as the baffle plate by keeping the fire in the fire box and letting the smoke up the flue - but also creating heat to the wet side of the system as a by-product. A Stove must NOT be used with this boiler fitted if the water is not plumbed in. Therefore, only fit when you are ready to couple with radiators or hot water.

This boiler is for indirect fitting - ie if using a hot water tank - the tank must be coiled and inhibitor should be put in the system which prevents rust and sludge built up. Only suitable for non pressurised, open vented systems

 A standard radiator is classed as 600mm x 900mm single rail convector type, and in an 8kw stove, in normal conditions it can feed four to five of such radiators OR a hot water tank and two single 900mm rads.

By purchasing this item, you will be supplied with the loose boiler and nuts / washers required to fit to the stove. You will need to have the holes in the cast iron cut to accept the boiler by a local engineering shop yourself or use a magnetic drill and diamond cutter. There are no instructions for fitting included as this may vary by stove model - SO PLEASE READ FOLLOWING INFORMATION CAREFULLY.

WE ARE WILLING TO FIT TO BRAND NEW STOVES PURCHASED FROM US AT THE SAME TIME AS THIS ITEM FOR AN ADDITIONAL SMALL FEE. WE WILL NOT FIT TO SECOND HAND STOVES OR STOVES PURCHASED FROM OTHER MERCHANTS

 We cannot offer technical plumbing or fitting advice for your stove and system other than contained in this listing.

SIZES GIVEN ARE APPROXIMATE AND MAY VARY VERY SLIGHTLY BETWEEN UNITS

Yes - it's only thin and only holds approx 2 litres of water. This is not much at all - but because the boiler fits ABOVE the firebox, it heats up very very quickly. It is for use with stoves which are to be top flued only unless they have a rear reversible flue type outlet which you can see here : http://naturalheating.blogspot.com/2010/02/benefits-of-rear-reversing-type-flue.html

It heats water far faster than the type of boiler that runs vertically up the inside of a stove and replaces the back lining panel. This is because this particular style of boiler takes direct heat from the flames as well as keeping the heat in the full body of the stove.

It is NOT suitable for a stove with a firebox body smaller than the following models (which you can find in our shop) : Trilby, Nuri, Buckingham, Coachman 8kw, Elite 8kw, Maid, Butler. It will NOT FIT : ACORN 6kw (or any 6kw stove), ASPECT, CROFTER as the fire boxes on these models are too shallow internally to fit the boiler and allow the stove and chimney to draw.

We recommend you only fit this to a new stove. In stoves which have been in use for some time, the metal will be cured and hardened which gives a greater risk of cracking the cast iron when you cut the holes in the body. It can be done, but AT YOUR OWN RISK.

The outlet pipes on the boiler are only 1/2" BSP thread. You will need to up this to 25mm on a pumped system to supply radiators. It can be gravitationally fed to a hot water tank - but we do NOT advise this with radiators. Supply to radiators MUST be pumped and a Honeywell L641 pipe thermostat needs to be fitted within 1 metre of the stove on the hot out and set to 55deg C. A motorised valve should be fitted round your pump. This should be in closed position when power is present and open if power fails to allow water to bypass the pump. At least one of the rads should be fitted with locksheild valves. If gravitational fitting to a hot water tank, make sure the hot pipe goes straight up and that it is at least 28mm diameter. Copper piping should be used for at least the first 3 metres

The small boiler is likely to supply MORE to the wet side of the system than stated when fitted into larger stoves. If the boiler is much smaller than the width of the original baffle plate, you will need to custom modify your baffle to fit WITH the boiler so excess heat is not lost up the chimney. It's very important with rads to fit a header tank and be aware that it may be necessary to fit extra rads if too much hot water is being produced.

** ALL OUR BOILERS ARE INDEPENDENTLY PRESSURE TESTED FOR QUALITY ASSURANCE. IT IS IMPORTANT TO SET UP A SYSTEM PROPERLY TO PREVENT KETTLING THE PIPES DUE TO OVERHEATING OR WATER NOT MOVING ROUND THE SYSTEM FAST ENOUGH. THIS ITEM SHOULD ONLY BE CONNECTED TO A WET SYSTEM BY A KNOWLEDGEABLE AND QUALIFIED PLUMBER. YOU CANNOT FIT THESE BOILERS INTO PRESSURISED SYSTEMS**