Post by
float_6969 »
https://forums.nicoclub.com/float-6969-u780.html
Tue Jan 28, 2014 7:20 am
About the hot water heater. First question, is it gas or electric? If it's electric, they usually do pretty well with keeping the water hot. If it's not doing that, you may have an element burned out. (they almost always have 2). Increasing the temp of the hot water does artificially increase the capacity of the hot water because you have to mix cold water in to cool it down, and so you use less hot. They actually sell a mixing valve assembly that plumbs into the top the the hot water heater that takes this principle into account to cheaply and easily increase a hot water heaters capacity. The valve mounts on the hot side of the tank, but has a water connection to the cold side. It allows cold water to flow into the hot water outlet stream and maintains the hot water outlet at a specified temperature (usually adjustable). Generally you keep the tank at or above 140°F, and then set the mixing valve to whatever you want the outlet temperature to be.
Another thing to remember is that in the winter months you "lose" some capacity. The tank will heater the water as it comes in to some extent. During the summer months, it only has to heat the water from about 60°. During the winter, it may have to heat it from 40°. That 20° is a big difference. So not only does it take longer to heat the water from a cooler temperature, but it's also cooling down the water that's in the tank already more than it would.
All of these things work together in the winter to make it seem like the hot water heater is broken, when it's not. And installing a bigger tank will only help so much. There are arguments that say that a smaller tank at a higher temperature with a mixing valve installed is more efficient than a larger tank at a cooler temperature. I've never seen anything that definitively proves that one way or the other though. They also sell blankets to wrap the tank to help hold the heat in.