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Hydronic Heating - protection against corrosion
my son has an 8 year old hot water heating boiler (I think called Hydronics) in his home. When new, I don't believe any type of additive was put in the boiler/piping/radiators. 2 weeks back, I drained a small amount of water out of the boiler drain, and the water looked very clear. A couple of questions:
1. Should I PH test the water?
2. Is the fact that the water from the boiler drain was very clear an indication that there is no need for a conditioner to be present in the water to protect from future corrosion of the boiler / piping / radiators?
3. If it is advisable to add an additive, would Rectorseal 8-way be suitable?
I've only added water to the system perhaps 2 times in 8 years, and it was due to a radiator valve dripping, and that has now been repaired. (by repacking the stem)
thanks, and feel free to add other information if you wish, I enjoy reading folks answers that have more experience than I, which is not much.