: These allow the boiler to adjust its flame size (firing rate) up or down based on demand, rather than just being "on" or "off". Built-in Leak Sensors : Found in premium models like the Rheem Prestige Combi Boiler Go to product viewer dialog for this item.
: By operating at lower temperatures when possible, it reduces the stress on the boiler's components. Other Essential Modern Features When shopping, you should also check for:
, this feature can automatically shut off the water valve if a leak is detected to prevent property damage. : Many modern boilers, such as the Rinnai I-Series Plus Go to product viewer dialog for this item.
What to look for in a new hot water based (boiler) heating system
This feature uses an outdoor temperature sensor to communicate with the boiler's control system. Instead of the boiler firing at a fixed, high temperature every time the thermostat calls for heat, it automatically adjusts the water temperature based on how cold it actually is outside.