JPS57157954A - Heater for bath - Google Patents

Abstract

PURPOSE:To prevent the lowering of the bath temperature due to bathing in order to improve the comfortableness, by calculating an amount of heat supply corresponding to a bath temperature increasing rate from a predetermined bathing period and a bath temperature at the end of bathing, and changing it to a heating signal to control a heating capacity variable heat source section. CONSTITUTION:When one takes a bath, a select signal of a microcomputer is set as bathing, and a bathing period ti, a bath temperature To at the end of the bathing, a calorie Q for heating per unit period of a gas burner 4 and an amount M of hot water are inputted as original predetermined values into a microcomputer 18. The microcomputer 18 processes these inputted signals and a bath temperature at the start of the bathing inputted from a bath temperature sensor 7 to obtain a bath temperature increasing rate, a required calorie, a heating proportion, and a heating period tau to output a closing-opening controlling signal for a hot water supply closing-opening valve. Thus the closing-opening valve is opened for a period tau, the gas burner is operated to feed bath to a bathtub through a hot water supply pipe so that the bath temperature is kept at a prscribed temperature. Accordingly, the lowering of the bath temperature during the bathing can be prevented, and therefore there is no lowering of the bath temperature at the end of the bathing so that the comfrotableness can be improved.