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- 185
Indeed, I guess I assumed that when a professional is doing the install, they would automatically go for a sealed system, it did not occur to me that they might want to leave it vented. Along with inhibitor, sealing the system should stop the corrosion that is generating the problem in the first place, which is always going to be worse on a vented system. Without going too far off topic, I agree with the whole system approach, I am bit surprised you can run 12 flats with 35kw for hot water. I'd be tempted to go with a larger buffer and size the boiler for both, although separate systems also have their advantages.