Why does my hot water stop when the sprinklers run?
Running an in-ground irrigation system can cause a massive pressure drop throughout the house, which temporarily halts hot water flow at faucets and showers until the sprinklers turn off. This sudden loss of pressure prevents normal water usage entirely during watering cycles and leaves homeowners wondering if they simply have to live with the issue.
What the numbers show
Counted from the threads quoted below. How we count
- People have been saying this in most months since September 2026.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1Living with the issue and waiting a minute or two after the sprinklers turn off for hot water to return.Did this help you?
- 2Partially closing the main irrigation valve slightly to reduce the noise and pressure drop.Did this help you?
- 3unscrew the priming plug and fill with waterDid this help you?
- 4Adjusting the water pressure regulator.Did this help you?
- 5Checking if the main water shutoff valve is partially closed.Did this help you?
- 6Checking for incorrect pipe sizing, such as too many taps off a half-inch line.Did this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I currently have no water at my house.”source ↗
“There is no hot water at any faucet or shower while the irrigation is running and it takes a minute or two to come on once the sprinklers have turned off”source ↗
“is there anything I can do about this or just live with it?”source ↗
“It says dry run”source ↗
Where this came up
People with this problem also raised
- 12Why is there no water pressure after changing a faucet?
- 8Why is only one tap losing hot water?
- 4Why is my lawn sprinkler not spraying far enough?
- 3Why does water pressure drop when another faucet turns on?
- 8Low hot water pressure at only one faucet
- 4Why does water flow drop drastically with normal pressure?