The low-temperature boilers get a seasonal performance around 94%, which means about 20% of energy savings compared with a conventional boiler. They allow obtaining water at low temperature, between 35-40°C, with better results of efficiency than conventional, and without generating problems of corrosion.
Do not need traditional chimneys
Low temperature boilers are typically direct vent systems
Better performance and operation
Corrosion may occur because it produces an acidic condensate
Problems with clogged heat exchangers
Incompatibility of the boiler with the existing distribution system
Small heat exchanger volumes
The most efficient boilers require a greater effort of investment (between 25-30% more). However it must be taken into account that the higher cost of a boiler of this type can be amortizable thanks to the potential energy savings to obtain, and the change of a boiler by other more efficient can also be financed.
Payback: high (between 8 and 10 years).
Maintenance costs for low-temperature boilers are typically much higher than with conventional equipment.