Don't have the issue since the house does not get below 70 degrees.
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I have a similar setup. Works great. My Apex graph looks exactly like yours. Question is what is the check valve for? Even with my recirc pump off I dont see any heat leakage coming through the pex.1. If you notice your aquarium water temperature trending down during the colder months what do you do? Increase the temp on your current heater(s), turn the house heat up more, add another aquarium heater or something else?
My Aquarium Temperatures are stable during the winter months because the aquarium is in the basement and because of the water volume of the system. I have never had a need to add additional heaters but I use a radiant heating system and I keep the house temp between 68-74F but the aquarium temp is set to 78. From the graph below the temp is very stable. If I ever lost the heating system for the aquarium then I would turn the temperature up in the house and if I was desperate I would use an electric aquarium heater. I no longer use electric heaters outside of heating for water changes as they are not always reliable and are very inefficient when it comes to heating large volumes of water.
2. How many heaters do you run, how many total watts, and how many gallons of water do you have to heat?
I run one radiant heating system loop through my aquarium system which is ~2100 gallons of water but that will be increasing once my display tank is finished. The radiant heating loop passes through my 50gallon natural gas hot water heater using a PEX loop with a recirculation pump and redundant temperature controllers.
My house stays about the same temp year round, my issue is I use an outside air intake for my skimmer. The effects my tank temp a lot.Other. I don't have this issue. We get Cole, but the house stays fairly temperate year round.