Removing tar from inside solid fuel boiler

Marycelineok

Currently trying out different fuels and temperatures on our Polish boiler. However there seems to be a build up of "shinny black deposit" tar? on sides. Tried to remove with scraper whilst hot and cold. Very difficult to get off. Any ideas?

Jack180570

Marycelineok wrote: »

Currently trying out different fuels and temperatures on our Polish boiler. However there seems to be a build up of "shinny black deposit" tar? on sides. Tried to remove with scraper whilst hot and cold. Very difficult to get off. Any ideas?

What type of boiler do you have? The 'shinny black deposits' are caused primarily by low firebox/combustion temperatures. If you can increase the firebox temps sufficiently during combustion you will be able to burn off the deposits an will change to a brownish loose soot type compound which is normal.

Jack180570

Marycelineok wrote: »

Currently trying out different fuels and temperatures on our Polish boiler. However there seems to be a build up of "shinny black deposit" tar? on sides. Tried to remove with scraper whilst hot and cold. Very difficult to get off. Any ideas?

What type of boiler do you have? The 'shinny black deposits' are caused primarily by low firebox/combustion temperatures. If you can increase the firebox temps sufficiently during combustion you will be able to burn off the deposits an will change to a brownish loose soot type compound which is normal.

Jack180570

Marycelineok wrote: »

Currently trying out different fuels and temperatures on our Polish boiler. However there seems to be a build up of "shinny black deposit" tar? on sides. Tried to remove with scraper whilst hot and cold. Very difficult to get off. Any ideas?

What type of boiler do you have? The 'shinny black deposits' are caused primarily by low firebox/combustion temperatures. If you can increase the firebox temps sufficiently during combustion you will be able to burn off the deposits an will change to a brownish loose soot type compound which is normal.

Jack180570

Marycelineok wrote: »

Currently trying out different fuels and temperatures on our Polish boiler. However there seems to be a build up of "shinny black deposit" tar? on sides. Tried to remove with scraper whilst hot and cold. Very difficult to get off. Any ideas?

What type of boiler do you have? The 'shinny black deposits' are caused primarily by low firebox/combustion temperatures. If you can increase the firebox temps sufficiently during combustion you will be able to burn off the deposits an will change to a brownish loose soot type compound which is normal.

Jack180570

Marycelineok wrote: »

Currently trying out different fuels and temperatures on our Polish boiler. However there seems to be a build up of "shinny black deposit" tar? on sides. Tried to remove with scraper whilst hot and cold. Very difficult to get off. Any ideas?

What type of boiler do you have? The 'shinny black deposits' are caused primarily by low firebox/combustion temperatures. If you can increase the firebox temps sufficiently during combustion you will be able to burn off the deposits an will change to a brownish loose soot type compound which is normal.

Jack180570

Marycelineok wrote: »

Currently trying out different fuels and temperatures on our Polish boiler. However there seems to be a build up of "shinny black deposit" tar? on sides. Tried to remove with scraper whilst hot and cold. Very difficult to get off. Any ideas?

What type of boiler do you have? The 'shinny black deposits' are caused primarily by low firebox/combustion temperatures. If you can increase the firebox temps sufficiently during combustion you will be able to burn off the deposits an will change to a brownish loose soot type compound which is normal.

Marycelineok

Moderator unica sensor 10. Had reduced ch temp to 50c to conserve fuel. Now increased back to 65c. Will this burn off tar or will I need to increase further. If so what temp should I increase to?

Jack180570

Marycelineok wrote: »

Moderator unica sensor 10. Had reduced ch temp to 50c to conserve fuel. Now increased back to 65c. Will this burn off tar or will I need to increase further. If so what temp should I increase to?

I'm not familiar with the boiler, the fuel or the installation so can't offer specific advice.
If burning firewood it needs to be under 25% mc, ideally 20%.
It would be beneficial to have a laddomat mixer valve fitted so as to ensure the boiler return temp is over 60d to avoid condensation and also to improve boiler performance.

Marycelineok

Thanks for your help. We have a return valve fitted. The recommended minimum return temp is 55c. I have increased return temp to 55c and most of deposits have burned off. This means we have to set ch at 65c and boiler tries to maintain a temp between 70 and 73. If temp drops to 64 flow to house is reduced and stops at 55.

Don't want to increase temp anymore as we had a problem whist away st Christmas. Oil ch was set on timer but did not kick in despite being tested. Some of our "stone" tiles lifted up in a v shape against the next tile. No leak. Tiler reckons that it was because of high ch temp. We had been running at 70 which means boiler was between 75 and 78.

65 seems to be ok and may increase to 70 once a week when boiler is cleaned

Jack180570

Marycelineok wrote: »

Thanks for your help. We have a return valve fitted. The recommended minimum return temp is 55c. I have increased return temp to 55c and most of deposits have burned off. This means we have to set ch at 65c and boiler tries to maintain a temp between 70 and 73. If temp drops to 64 flow to house is reduced and stops at 55.

Don't want to increase temp anymore as we had a problem whist away st Christmas. Oil ch was set on timer but did not kick in despite being tested. Some of our "stone" tiles lifted up in a v shape against the next tile. No leak. Tiler reckons that it was because of high ch temp. We had been running at 70 which means boiler was between 75 and 78.

65 seems to be ok and may increase to 70 once a week when boiler is cleaned

Thats excellent and thanks for the feedback