We have a one level bungalow with no basement heated by infloor radiant heat. The heavy duty hot water tank is run by natural gas. There is a large white thermostat attached to the infloor heating components and from my understanding from the previous owner is set to stay at 105 degrees. When taking a shower this am I noticed that the water is not as hot as normal (not cold , so after checking the thermostat it shows 80 degrees. Not sure where to start with trouble shooting, is it the hot water tank; just the thermostat of something else. Our infloor heat is working and we have hot water. Not sure if this is normal from time to time of a sign that the heating element in the hot water tan is going. The hot water tank is a rental so that would be easy to get done, do I need to call a heating contractor regards to this or call the company that rents us the hot water tank. Sorry about the long post but more info i give is better for me not being the best handyman on the block. After some input from other sources its possible I guess that the water from the pump to the floor just cooled off as demand was not needed as it bumped up later in the day to the correct setting of 105 degrees that the grey dial on the pump is set to.