What size bladder tank for a remote cabin with intermittent use?

Choosing the Right Bladder Tank Size

When selecting a bladder tank for a remote cabin, consider the number of people using it, their water usage habits, and the water supply source. A general rule of thumb is to size the tank for 1-2 days of stored water, based on average daily consumption. For a single person or occasional visitor, a 20-gallon bladder tank might be sufficient.

Calculating Water Pressure Requirements

To ensure adequate water pressure, consider the elevation and piping requirements. A 20-gallon bladder tank can provide around 30-40 psi (pounds per square inch) of water pressure at the highest point in the system, assuming a 100-foot elevation change and 1/2-inch ID (inside diameter) piping. This pressure is sufficient for most residential applications, including washing dishes, brushing teeth, and taking showers.

Considering Additional Factors

When sizing a bladder tank, don’t forget to account for other factors that may impact water pressure and usage. These include the type of fixtures used, the water heater capacity, and the overall system efficiency. For example, low-flow showerheads and faucet aerators can reduce water consumption and increase system pressure. Additionally, consider installing a pressure-reducing valve (PRV) to regulate the water pressure and prevent damage to the piping and fixtures.