Central heating systems have been in use now for decades. For the most part, such systems work flawlessly for many years, both commercial and residential versions. However, when heating deficiencies are observed, a loss in water pressure could be caused by a leak in or around the boiler of the water heater or heat exchanger. The problem becomes compounded from the fact that finding the source of the leak can be difficult.
Instructions Visual Checks - Locate and check your hot water heater's exterior and relief valve for any moisture or water from as many angles as you can.
If your water heater includes the use of a heat exchanger and heat connector, Inspect these systems for any water or moisture evidence or even the musty odor of water. If you suspect your heat exchanger might be the problem, only a residential plumbing company will be able to service this issue properly.
For water droplets discovered on the colored paper, attempt to feel and follow the probably dripping location from the water heater. Contact a service technician to remedy the problem.