These gas heater controllers are used to control older style "water heater" gas heaters for spas. Replaces old style semi-analogue & digital controllers and flow-activated gas heaters like the L.A.D. gas control equipment, SpaceAge, etc. Some use a solenoid valve. Others may not. Several version listed under Models belwo.
- Onga Ultra
- Bosch Leisure
- and many other (typically older) bypass style "water heater" gas heaters.
Space Age branded models - no longer sold.