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On-demand water heater fails to ignite for hydronic heating

🏠 homeproduct problemSingle report ●●●●● severity 3/5

A homeowner reports that their Takagi T-K Jr on-demand water heater fails to ignite when the hydronic floor heating system's pump activates, even though it ignites correctly when a hot water faucet is opened.

Who's affected: A homeowner with a hydronic floor heating system powered by an on-demand water heater.

⚠️ Single report. This is one person's account. We mark it so until more voices confirm it.

What people do today

🔧 Fix this

Ideas a builder, maker or community group could start on:

  1. A diagnostic guide specifically for hydronic heating integration with tankless water heaters
  2. A flow-sensing bypass valve kit that ensures minimum flow requirements for tankless ignition in closed-loop systems
  3. A smart controller that manages pump activation and ignition signals to ensure the heater stays active during heating cycles
I want to build this

Real voices

“the pump turns on but the water heater isn't igniting”

Source: Stack Exchange (diy) · CC BY-SA 4.0, user-contributed content from Stack Exchange; summarized and modified

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