plumbing or tankless water heater?
We have a Takagi tankless hot water heater (1st generation - I think it's a TK-1) A couple of months ago, we noticed that the water was not getting as hot as it used to. Previously, the water got so hot that you would actually have to turn it more to the cold side on occasions in order not to get burned. As it is now, you have to turn it all the way to hot to get it hot enough for a shower, but it is just hot enough. When you turn on the hot water only on the tub in 2 of our bathrooms, it starts to feel like it is heating up but after about 10 seconds it turns completely cold. In our master shower we have dual single handled shower heads and this is the only place we can get hot water - but like I said, just hot enough. We spent $150 on a svc call from a co recommended by Takagi as a certified tech. He said that there was nothing at all wrong with our water heater and recommended that we replace the mixing valves in our shower heads and said that should fix the problem. We spent $100 doing that (parts alone) and it didn't do a darn thing! We still cannot get any hot water in 2 of our bathrooms and water in the master not hot enough. Any suggestions? We've got $250 in this so far (could have put a regular water htr in for that price) and still no hot water! Oh, and it is operated on propane gas. HELP!