1. Will the water level of a storage type water heater drop when the hot water is running?

No. Cold water will automatically be refilled when hot water is running. The water level in the storage tank maintains at the same level at all time.

2. Can I change the showerhead that is connected to a storage type water heater?

Only the showerhead that is supplied with the shower unit should be used. For safety reasons, showerhead helps releasing steam and pressure inside the tank under normal operating condition.

3. What safety measures are included in an unvented water heater?

There are 5 built-in safety measures, including a thermostat, an overheating fuse, 2 temperature pressure release valves, and an anti-vacuum valve, which conform to the Electrical Products Safety Regulation.

4. How long does an unvented water heater take to heat up 25 litres of water? And how much electricity does it consume?

It takes approximately 20-25 minutes, and the water heater will consume about 1 unit of electricity (around HK$1).

5. Does storage type water heater consume less energy than instantaneous type water heater?

There is no difference in the amount of electricity consumption between the two types of water heater.

6. Does storage type water heater more expensive to run than other fuel-powered water heater?

Given that the heating element of an electric water heater is entirely immersed, heat transfer is highly energy efficient. In general, electric water heater cost 15% less to run than other fuel-powered water heater does, thus it is more economical.

7. Any requirement to note when choosing instantaneous or storage type water heater?

If 3-phase power is available (as in most new built village houses), an instantaneous 3 phase water heater would be a great choice. If the living flat is designed with single-phase power, a storage type water heater is more suitable.

8. Considering the multiple benefits of an instantaneous water heater, why isn't it suitable for all families?

Instantaneous water heater requires 3-phase power, which is not always available in every apartment. Most new built village houses are equipped with three-phase power, so 3-phase instantaneous water heater can be installed. However, the electricity supply design (single-phase or 3-phase) in an apartment depends on the decision of the developer.

Residents living in apartments with single-phase power can either choose to install a centralised electric water heater with a capacity of about 25-38 litres, or a shower storage type water heater with a capacity of 18 litres.


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