Pumping Water 30 Feet: Choosing the Right Pump for Your Pool to Roof System

For a swimming pool owner looking to elevate water 30 feet to their roof and then return it to the pool, the choice of the right water pump is crucial. In this detailed guide, we will walk you through the key considerations and provide recommendations for the most suitable pump for your specific needs.

Key Considerations When Choosing a Water Pump

To determine the appropriate water pump for your pool to roof system, several factors need to be taken into account. These factors include the height of the vertical lift, the desired flow rate, and the resistance provided by the garden hose and fittings.

Vertical Lift Head

The primary challenge in this system is lifting the water 30 feet vertically from the pool to the roof. A pump capable of handling at least this distance is necessary. However, it is wise to account for additional head loss due to friction in the hose and fittings. Friction loss ensures that the pump's output is not affected due to resistance within the system.

Flow Rate

Decide how quickly you want to circulate the water. Common flow rates for such systems might range from 2 to 10 gallons per minute (GPM) depending on your specific needs. Evaluate the system to determine your required flow rate, which will be influenced by the size and number of coils of hose, as well as the desired rate of water circulation.

Hose Size and Length

The diameter and length of the garden hose play a significant role in the total friction loss. A standard garden hose is typically 5/8 inch in diameter. The length of the hose and its diameter contribute to the head loss, which needs to be factored into the total dynamic head (TDH). Use a friction loss chart or an online calculator to determine the appropriate head loss for your specific setup. For example, a 100-foot length of 5/8-inch hose might have around 4-5 feet of head loss at 5 GPM.

Calculating Total Dynamic Head (TDH)

Static Head

The static head is the height to which the water needs to be lifted, which in this case is 30 feet. This is the primary portion of the total dynamic head.

Friction Loss

Friction loss is the resistance that the water encounters in the hose and fittings. It is essential to calculate this to ensure that the pump can handle the total head loss. Use a friction loss chart or calculator to determine the friction loss of your specific hose size and length at the desired flow rate.

Example Calculation:

Assuming a 30-foot static lift and a 5-foot friction loss:

Total Dynamic Head (TDH) Static Head Friction Loss

Total Dynamic Head (TDH) 30 ft 5 ft 35 ft

Pump Selection

Type of Pump

Two common types of pumps can be used for this application: submersible pumps and centrifugal pumps. Submersible pumps are typically quieter and can be placed in the pool, which can be beneficial. Centrifugal pumps can be used above ground and are popular for their versatility.

Size and Specifications

The pump must be capable of handling the total dynamic head (TDH) of 35 feet at your desired flow rate. For example, if you need a flow rate of around 5 GPM, look for a pump that can deliver that flow rate at 35 feet of head. Performance curves of the pumps provide detailed specifications on the flow rate and head lift capabilities.

Recommendations

Submersible Pump:

A pump rated for at least 35 feet of head with a flow rate of around 5-10 GPM would be suitable. An example model is:

Wayne CDU980E 3/4 HP Submersible Pump

Centrifugal Pump:

A pump that can handle the required TDH and flow rate is necessary. An example model is:

Superior Pump 91250 1/4 HP Thermoplastic Submersible Utility Pump

Additional Tips

Ensure the pump has adequate power supply and is suitable for outdoor use if located outside. Adding a timer or flow control can help manage the water circulation effectively and optimize energy usage. Consult the specific pump's documentation for precise suitability to your needs.

Proper equipment selection and setup are crucial for a successful pool to roof water circulation system. With the right pump and attention to detail, you can ensure an efficient and reliable system that meets your needs.