Which is better, direct discharge or forced discharge of gas water heater?

1. Direct-discharge gas water heater: simple structure, ready to use, no need to preheat in advance, easy to use.

2. Forced exhaust gas water heater: The forced exhaust gas water heater directly exhausts the waste gas to the outdoor through pipelines, which has high safety; The thermal efficiency is high, the theoretical thermal efficiency is above 88%, and the water output is large, which can meet the needs of kitchen and bathroom at the same time and has high bathing comfort.