What Is a Continuous Flow Hot Water System and Is It Worth It?

How Continuous Flow Hot Water Works

When you turn on a hot tap, cold water flows through the unit and is heated instantly — either by a gas burner or electric element. As long as the tap is open, you have unlimited hot water. There's no tank to run empty and no standby heat loss from stored water cooling down.

Continuous Flow: Pros and Cons

• ✅ Unlimited hot water — never runs out
• ✅ No standby energy loss
• ✅ Compact — saves space
• ✅ Long lifespan (15–20 years for gas models)
• ❌ High upfront cost
• ❌ Electric models need very high peak power (15–25kW) — may require wiring upgrade
• ❌ Gas models require a gas connection (and flue installation)
• ❌ Flow rate limited: multiple high-flow outlets simultaneously may reduce temperature

Is It Worth It for Christchurch Homes?

Continuous flow gas is worth it if: you have an existing gas connection, you have high simultaneous hot water demand, and you have 2+ bathrooms in regular use. For most standalone Christchurch homes replacing a single cylinder, a heat pump system offers comparable benefits (efficient, effective) at better long-term value.