Actually , the heater core doesn't have a drain
The heater uses the engine coolant to heat the vehicle. The radiator has a drain petcock along the bottom edge to drain the coolant system.
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Side of water heater, near bottom.
Fabia Cerra goes by Fabulous Fabia.
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Fabia Drake's birth name is Fabia Drake McGlinchy.
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Unless the heater is relatively new, the drain is going to be slow and in some cases not work at all. Rust and sediment collect in the tank and plug the drain.
Google Honda pilot block heater. There is a parts dealer that includes installation instructions showing where the plug is to drain the coolant. This is where the block heater screws in, replacing the bolt.
I'm not sure what you mean. A drain pan protects the area below the water heater from ruin if the water heater begins to leak. You can prevent major damage by putting a water alarm ($12) in the pan to be warned if the heater begins to leak.