rbachens

LG home comfort did respond quickly to every plea for help that I put to them. Three different crews were sent to address the noise and other issues we pointed out. None of the 3 crews sent were able to resolve the very loud humming noise that would start each and every time the cold water was used in my home. Every time we would use cold water, the noise would start. It was enough loud enough to constantly wake us up. One crew would blame the home plumbing, stating that there was a cross over flow from hot to cold somewhere. I assured them that the only place where that would happen is at any faucet outlet. That was where that it was supposed to happen. I tested my theory correct. The only time that hot and cold water mix is when a faucet is opened. A second crew, was as baffled as the first, even with help from the Manufacturer, Rinnai. It was suggested that they tap the plumbing the previous water tank used. That resulted in a no hot water situation for 2 days. The Tankless Water Heater (TWH) would shut down immediately after hot water was drawn. The third crew sent fixed the no hot water issue, and suggested that the noise issue was due to a water pressure difference between the hot and cold sides. He based this on the size of the pipes, cold side being 3/4 inch, and hot side being 1/2 inch. It would required a extra small 2 or 3 liter tank to absorb the pressure difference. Again, this is a theory as not a solution to the noise issue. What LG home comfort has not done so far, is to return my calls. I've called virtually every day to talk to anyone about the noise issue the TWH makes. What I want to have hot water given to me, as our previous hot water tanks did for the last 40 years, SILENTLY. I was told that some older homes, such as mine, cannot work with a TWH. If this is the case, and there is no fix for the loud noise the TWH generates, then the only possible fix, is to reinstall a hot water tank iN the same location where the previous one was. I am willing to purchase one from LG, but the TWH has to be removed. Update, I was contacted by their trouble shouting manager. I brought him up to date by recounting the above story. He said that he would get back to me later, which he did. He offered to have the TWH removed, but they only had 50 gallon commercial grade water heater tanks available for the next while. I agreed to his offer. The TWH was removed and a tank to heat the water was put in its place. Its a world of difference. We hear nothing when the water is heating, nor when its drawn. Commercial tank is more expensive that residential, but that is ok because it will last much longer.