Girard GSWH-1/GSWH-1M low flow, temperature swing, or limiting

Use this when a legacy Girard tankless water heater has low flow, temperature swings, limiting/cycling, or water that is too hot or not hot enough.

Owner-safe checklist

• Purge air from hot and cold water lines before judging temperature behavior.
• Follow the exact manual for the model: GSWH-1 uses hot-water flow and mode settings, while GSWH-1M uses gas-modulation and flow adjustments.
• Check owner-accessible faucet or shower restrictions only when the model manual allows it, and keep exterior louvers visibly clear.
• Call Lippert/Girard or qualified RV service for limiting or cycling that repeats, persistent flow problems, or any LED fault pattern.

Official sources

• Lippert Tankless Water Heater Model GSWH-1 Owner's Manual - EN/FR
• Lippert Tankless Water Heater Model GSWH-1M Owner's Manual - EN/FR