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Domestic hot water coil, tankless
I have a Burnham V7 series oil fired boiler model PV74WBT with the tankless coil. During the summer months I typically turn down the temperature of the water in the boiler to conserve energy to what extent it might help. I typically lower the temperature from 160/180 to 120/140. This time around I've noticed that the hot water temperature is not consistent, and often too cold. I investigated the mixing valve which we've had problems with in the past (taco model 5000), but it is in good working order. I then spent some time measuring the temperature of the water coming out of the tankless coil using an infrared thermometer measuring the surface temperature of the copper pipe. The temperature is about 90-95 degrees. The surface of the tankless coil measures about 125 degrees. The temperature gauge on the boiler measures about 155 degrees, and as I mentioned before the temperature is set to 120/140 on the tiny dials on the Honeywell control. My question is this: What is a typical temperature drop through a tankless coil and/or how can I evaluate whether my tankless coil is doing it's job properly? I'd like to see hot water temperature of about 120 coming out of the tankless coil, but it looks like I'm losing more than that along the way. Any help would be appreciated. Thank you.