The invention discloses a multifunctional gas 
water heater. The gas 
water heater comprises a 
water heater body, a 
heat exchanger mounted on the water heater body as well as a water inlet 
pipe and a water outlet 
pipe which are connected with the 
heat exchanger. The gas water heater is characterized in that a three-way valve is connected onto the water inlet 
pipe and divides the water inlet pipe into two branches, a water pump is arranged on one 
branch of the water inlet pipe, a water purifying and 
softening device is arranged on the other 
branch of the water inlet pipe, and 
ion exchange resin and 
activated carbon are arranged in the water purifying and 
softening device. Compared with the prior art, the gas water heater has the advantages that the water purifying and 
softening device is arranged, water scale production is effectively inhibited, and pipe blockage, especially blockage of a 
shower head, is avoided; meanwhile, the 
ion exchange resin and the 
activated carbon are arranged in the water purifying and softening device, 
hard water becomes 
soft water after passing through the 
ion exchange resin, the 
soft water contains little 
calcium magnesium salt and is smooth, and the 
bathing effect is better; the 
activated carbon purifies the water effectively, removes impurities and 
dirt, inhibits bacterium breeding and creates a safe, healthy and comfortable 
bathing environment.