alarm company network 27 which is branched to monitor a domestic location whereby the monitoring is effected at a central location of the alarm company the monitoring module may also be in communication with a water heater rental company which may have thousands of subscribers as shown in fig2 the monitoring module 15 is also provided with a series of led 39 s 28 which replicates the led 39 s 14 and 14 u2033 of the diagnostic device 10 this replication can be achieved by various detection means which detects the condition of the led 39 s 14 and cause the led 39 s 28 to illuminate to replicate the illuminated ones of the diodes 14 fig4 illustrates one embodiment of the detection means as shown in fig4 the detection module is located inside a depending wall section 18 of the module 15 as shown a series of cavities 30 in the module 15 are precisely aligned and spaced to be positioned adjacent the led 39 s 14 on the diagnostic device 10 optical detectors 31 which may be photocells detect the state of the led 39 s 14 u2032 and 14 u2033 lit or not lit positioned thereagainst in order to prevent light emission from adjacent led 39 s 14 and 14 u2032 to falsify the detection of the optical detectors 31.