Product Overview

The vertical hot water circulation pump works on the centrifugal force principle. When the motor drives the impeller to rotate at high speed, the hot water inside the pump obtains kinetic energy under the action of rotating blades. The liquid is thrown outward from the center of the impeller to the pump volute, converting kinetic energy into pressure energy.

Under pressure difference, hot water continuously flows into the impeller center from the suction inlet, forming continuous water absorption and water discharge. It realizes forced circulating transportation of high‑temperature hot water inside closed‑loop heating, boiler and heat‑exchange systems.

Adopting high‑temperature resistant mechanical seal structure, it effectively prevents hot‑water leakage and adapts to long‑time continuous operation of hot medium.

Working Principle of Hot Water Circulation Pumps

1.Centrifugal energy conversion

Motor drives the impeller to rotate at high speed. Hot water gains kinetic energy through the rotating blades, then flows to the pump volute, where kinetic energy is converted into pressure energy.

2. Continuous medium circulation

Pressure difference makes hot‑water constantly suck into the impeller center from inlet. It creates stable suction and discharge flow, realizing forced circulation of hot water for closed heating and heat‑exchange systems.

3. High‑temperature sealing protection

Equipped with high‑temperature resistant mechanical seal. It avoids medium leakage and supports long‑term continuous running under hot‑water working condition.

Intelligent linkage control, unmanned operation for peace of mind, equipped with intelligent control cabinet, integrated PLC, pressure transmitter, temperature sensor, supporting three operating modes:

One in use and one backup:

The main pump automatically switches to the backup pump in case of a failure, ensuring uninterrupted water supply;

Timed rotation:

Multiple pumps operate alternately at regular intervals to balance wear and extend the lifespan of the entire machine;

Variable frequency constant pressure:

Automatically adjust the speed according to the pressure/temperature of the hot water system, avoiding the "big horse pulling small car" and significantly saving energy.

Hot Water Circulation Pumps Selection

No.	Model	Rated Flow (m³/h)R	Rated Head (m)	Rotational Speed	Motor Power
1	ISG32-100	5	12.5	2900	0.55
2	ISG32-125	4.5	20	2900	0.75
3	ISG32-125A	4.5	16	2900	0.55
4	ISG32-160	5	32	2900	1.5
5	ISG32-160A	4.5	28	2900	1.1
6	ISG32-200	5	50	2900	3
7	ISG32-200A	4.5	44	2900	2.2
8	ISG40-100	6.3	12.5	2900	0.55
9	ISG40-100A	5.6	10	2900	0.37
10	ISG40-125	6.3	20	2900	1.1
11	ISG40-125A	5.6	16	2900	0.75
12	ISG40-160	6.3	32	2900	2.2
13	ISG40-160A	5.9	28	2900	1.5
14	ISG40-160B	5.5	24	2900	1.1
15	ISG40-200	6.3	50	2900	4
16	ISG40-200A	5.9	44	2900	3
17	ISG40-200B	5.3	36	2900	2.2
18	ISG40-250	6.3	80	2900	7.5
19	ISG40-250A	5.9	70	2900	5.5
20	ISG40-250B	5.5	60	2900	4
21	ISG50-100	12.5	12.5	2900	1.1
22	ISG50-100A	11	10	2900	0.75
23	ISG50-125	12.5	20	2900	1.5
24	ISG50-125A	11	16	2900	1.1
25	ISG50-160	12.5	32	2900	3
26	ISG50-160A	11.7	28	2900	2.2
27	ISG50-160B	10.4	22	2900	1.5
28	ISG50-200	12.5	50	2900	5.5
29	ISG50-200A	11.7	44	2900	4
30	ISG50-200B	10.6	36	2900	3
31	ISG50-250	12.5	80	2900	11
32	ISG50-250A	11.6	70	2900	7.5
33	ISG50-250B	10.8	60	2900	7.5
34	ISG50-250C	10	50	2900	5.5