| 摘要 |
<p>PURPOSE:To quickly complete the boiling by raising the thermal efficiency by enlarging the heat exchanging area of multiple heating units and circulating the burnt gas through the water heater vessel. CONSTITUTION:The water heater vessel 4 having in its upper and lower positions the connecting pipes 2, 3 connected to the bathtub 1 is housed in the heating vessel 5, and tubular heating units 6 are arranged in rows in the water heater vessel 4. The water heater vessel 4 has in its top a ventilation hole 7 opening to the space between itself and the heating vessel 5. Burners 8 are disposed under the heating units 6, and the heating vessel 5 is provided with a smoke pipe 9. The water in the bathtub 1 is circulated into the interior space between the heating units 6 and the water heater vessel 4 to heat the water. In this manner, the thermal efficiency becomes greater than prior bath boilers to allow a quick completion of heating.</p> |
