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So we just bought a house last week, and it has an oil furnace/boiler, which heats both the house and the water. It was serviced just before we moved in, and it's working to keep the house warm just fine. The hot water is tankless, with a coil in the boiler. The hot water is sometimes hot, sometimes cold, and it has nothing to do with the amount of things using water at a time. It will fluctuate even within one shower, with it starting cold and getting warmer and then getting cold, and so on. It's not very pleasant given that it's March in NH. In my online research, I've found that the coil can get blocked, and they did install a water softener in October, so I'm wondering if this has been a problem for a while. Does anyone have any ideas? Thanks :-)