If your home's central space heating works perfectly but you have no hot water, the problem is usually isolated to the domestic hot water production system. In combi boilers or tankless systems, a faulty diverter valve may be stuck in the heating position, routing all thermal energy to radiators instead of domestic taps. In traditional split systems, an independent water heater may have a tripped circuit breaker, a burned-out heating element, or a failed aquastat control. Verification: Inspect boiler diverter valves and check water heater power status independently from central heating controls.
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