Staff Answer
Jun 22, 2026 - 01:00 PM
Yes, the Aqua-Pro 5.5 GPM Fresh Water Pump (21863) is generally a good choice for use with most on-demand (tankless) water heaters. It provides a strong flow rate and consistent water pressure, which helps ensure reliable activation and operation of the water heater.
Key reasons:
- 5.5 GPM flow rate is more than enough for virtually all RV tankless water heaters, which typically require around 0.5–1.0 GPM minimum flow to activate and generally operate in the 1–3 GPM range.
- The pump has on-demand operation with a built-in pressure switch, so it automatically starts and stops as water is used.
- Its 60 PSI pressure rating is within the operating range of most RV plumbing systems and tankless water heaters.
- It uses variable flow technology, which helps maintain more consistent water flow and reduces cycling when the heater is running.
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