Hello - a first post here. I posted on a different forum (navitron.org.uk) hoping to get some help on the design of a boiler I am about to make for a wood-stove, but I raised little interest . Someone suggested that I posted here (cheers Fintray ).
Here is my project:
Our stove is an Italian made stove/cooker (La Nordica Rosetta - 6kw rated) with an OK sized fire box, a great top cooking surface, and a tiny oven. I installed knowing I would fit a boiler when I could get round to it (I have done one before in a different stove, but about 16 years ago). I want to use a top boiler so that I don't decrease the depth or width of the fire box and at that same time, I still want to let direct heat through to the hob (so we can still cook on it - it makes toast really well). So I am thinking of a boiler of tubes, rather than a box. I am thinking of making a U shape from 2" bore heavy duty mild steel pipe which I am going to weld up with with weld elbows and 3/4 BSP studs on plates at the ends that pass through the stove wall and will themselves receive BSP to 22mm brass elbows. I think I will tilt the U slightly so that there is a rise within the stove body. I have calculated that this will give a boiler volume of about 1.47 litres - which aint very much, but there will be lots of surface area. I could also add one or two cross pieces out of 1 1/2 bore pipe to increase volume/surface, and still get lots of direct heat to the hob.
I want to heat 12 gallons of water, and feed one radiator. I know I need to ensure that I have enough capacity to dump out unwanted heat in the system. I intend to use 22mm copper to run to the cylinder which is 4m away.
Questions:
Can a tube boiler have a significantly smaller volume than a jacket/box, as there is proportionally more surface area?
Has anyone made a similar boiler of tubes - what are the difficulties (harder to weld) - any unforeseen problems? I was going to use my inverter plant as I am more used to stick than mig, but i could get hold of a Mig plant.
Thanks
Baffle
Here is my project:
Our stove is an Italian made stove/cooker (La Nordica Rosetta - 6kw rated) with an OK sized fire box, a great top cooking surface, and a tiny oven. I installed knowing I would fit a boiler when I could get round to it (I have done one before in a different stove, but about 16 years ago). I want to use a top boiler so that I don't decrease the depth or width of the fire box and at that same time, I still want to let direct heat through to the hob (so we can still cook on it - it makes toast really well). So I am thinking of a boiler of tubes, rather than a box. I am thinking of making a U shape from 2" bore heavy duty mild steel pipe which I am going to weld up with with weld elbows and 3/4 BSP studs on plates at the ends that pass through the stove wall and will themselves receive BSP to 22mm brass elbows. I think I will tilt the U slightly so that there is a rise within the stove body. I have calculated that this will give a boiler volume of about 1.47 litres - which aint very much, but there will be lots of surface area. I could also add one or two cross pieces out of 1 1/2 bore pipe to increase volume/surface, and still get lots of direct heat to the hob.
I want to heat 12 gallons of water, and feed one radiator. I know I need to ensure that I have enough capacity to dump out unwanted heat in the system. I intend to use 22mm copper to run to the cylinder which is 4m away.
Questions:
Can a tube boiler have a significantly smaller volume than a jacket/box, as there is proportionally more surface area?
Has anyone made a similar boiler of tubes - what are the difficulties (harder to weld) - any unforeseen problems? I was going to use my inverter plant as I am more used to stick than mig, but i could get hold of a Mig plant.
Thanks
Baffle