Hot Water Circulating Pumps for Solar Hot Water Systems

March, Laing & Ivan hot water circulating pumps

We do not sell solar hot water systems. We sell only the pumps for them. Circulating pumps all have very low head/pressure ratings. They are designed to move water in a closed system, not provide pressure. Most are limited to 7 to 14 foot max.

PV and battery powered circulation pumps for solar heating. Closed-loop using water or glycol solution.

Hydronic radiant floor space heating. For off-grid or uninteruptible battery backup.

Advantages

For solar water heating (PV-direct)

Use a small PV module (photovoltaic panel) to power the pump. No battery or electronic controller is used, except for battery only rated pumps. There is no wiring to the building's electric system.

Sun-synchronous operation: pump speed varies with sunlight, corresponding to the available heat in the collector—natural automation!
This principle has proven highly reliable in solar water heaters since the early 1980's. For hydronic heating (using battery system)
Power requirement is less than half that of conventional AC pumps powered by inverter.

Additional energy savings can be realized by using individual zone pumps instead of a single pump with zone valves. This method can reduce power consumption by 75%.
Energy saving greatly reduces the size and cost of the power system required.

Features

Magnetic drive
These pumps feature seal-less magnetic coupling to the impeller. There is no seal friction, no seal wear, and no chance of seal leakage.
Advanced motors
Laing & Ivan pumps use brushless motors that are maintenance-free.
March pumps use brush-type motors with typical brush life of 2-5 years. Brushes are easy to replace without removing the pump.


Temperature and Pressure Limits (typical, individual pumps will vary)
• Maximum: 250°F (120°C) at 150 PSI (10 bar)