| When purchasing your wood boiler or woodstove | | | | will protect any aluminum, copper, and solder from |
| make sure to use the proper corrosion inhibitors | | | | corrosion. |
| to protect the metallurgy in your boiler system. | | | | The most common antifreeze for wood boilers |
| Even if your wood boiler is stainless steel it will | | | | and woodstoves is propylene glycol. Propylene |
| corrode from the outside in. Woodstove | | | | glycol is considered a safe form of Antifreeze. |
| manufactures use a cheap grade of stainless steel | | | | Dilute your Antifreeze to a 40% solution. This will |
| and the iron will each through to the water side | | | | protect your system from freezing up to -40F. |
| resulting in premature boiler failure. | | | | Do not use RV Antifreeze. They claim to protect |
| A proper corrosion inhibitor should include a one | | | | to -50F, but it does not. I get at least one call a |
| that is high in pH, above 10.5, and it should contain | | | | week from someone that had there system |
| Nitrite, Borate, Silicate, and Tolyltriazole. This Nitrite | | | | frozen and pipes destroyed. Spend the extra |
| portion of the corrosion inhibitor mixture will | | | | money and buy 95% corrosion inhibited propylene |
| passivate your mild steel. The higher pH will | | | | glycol. The 5% is the corrosion inhibitor that is an |
| decrease your over all corrosion rates on the mild | | | | all organic chemistry designed to work well with |
| steel. Hot water becomes more corrosive at | | | | glycol to minimize your boiler corrosion rate. The |
| higher temperature., so it is important to have a | | | | same chemistry discussed above can also be |
| higher alkaline product. The borate, silicate, and TT | | | | used in heated home floor systems. |