Product Overview & Application Range
The HKS Lazar SmartFire SF15 Standard is an automatically fed pellet boiler with a nominal heat output of 15 kW for water-based central heating systems. With an output range of 4.5 to 15.0 kW, the boiler adapts its heat output to the current heat demand of the heating system within its modulation range.
Wood pellets are used as fuel. The SmartFire SF15 is suitable for building heating and can be integrated into a heating system with domestic hot water preparation. For pellet storage, three storage containers with capacities of 150, 240, or 440 liters are available.
Technology & Equipment
The SmartFire SF15 features a stainless steel pellet burner with automatic ignition and automatic mechanical burner cleaning. Fuel is supplied via a screw conveyor and a backburn protection lock that structurally separates the pellet supply from the combustion chamber.
The GEMA Standard version is supplied without a lambda sensor, without automatic heat exchanger cleaning, and without automatic ash removal. The heat exchanger is cleaned mechanically via the designated cleaning mechanism. The automatic cleaning of the pellet burner remains an integral part of the boiler regardless of this.
The equipment includes weather-compensated control with a touch control panel as well as the hydraulic kit TV-Kit. The integrated thermostatic valve ensures a minimum return temperature of 55 °C and protects the boiler from low-temperature corrosion.
Everyday Benefits
Pellet feeding, ignition, and burner cleaning run automatically. As a result, regular operation focuses on checking and refilling the pellet supply, mechanical heat exchanger cleaning, and the prescribed cleaning and maintenance work.
With three different container sizes, the SmartFire SF15 can be adapted to various space conditions and desired pellet supplies. The 150-liter container offers the smallest footprint, while the 240 and 440 liter variants provide larger fuel supplies.
System Integration & Compatibility
The SmartFire SF15 Standard is designed for water-based central heating systems. Hydraulic integration is carried out taking into account the required return temperature of at least 55 °C. In this version, the boiler has a maximum permissible operating pressure of 1.5 bar; the separately documented SF15-3-bar version is not part of this article.
With a 150-liter storage container, the overall dimensions are 985 × 1490 × 760 mm. The 240-liter version measures 1180 × 1490 × 805 mm. With a 440-liter storage container, the overall dimensions are 1345 × 1490 × 1015 mm.
For automatic pellet supply from a larger or spatially separated pellet storage, the pneumatic HKS Lazar Vacum pellet conveying system can be used as separate accessory.
Technical Data at a Glance
| Nominal heat output | 15 kW |
| Output range | 4.5–15.0 kW |
| Efficiency at rated output | 92.0% |
| Energy efficiency class | A+ |
| Boiler class | Class 5 per EN 303-5 |
| Fuel | Wood pellets |
| Pellet consumption at rated output | approx. 3.3 kg/h |
| Ignition system | Automatic ignition |
| Burner cleaning | Automatic, mechanical |
| Heat exchanger cleaning | Mechanical / manual |
| Lambda sensor | No |
| Safety heat exchanger / cooling loop | No |
| Required chimney draft | 5–10 Pa |
| Flue gas temperature at rated output | 120 °C |
| Flue gas outlet outside / inside | 120 / 110 mm |
| Max. boiler temperature | 85 °C |
| Min. return temperature | 55 °C |
| Max. operating pressure Standard | 1.5 bar |
| Boiler water content | 37 liters |
| Power consumption at rated output | 48 W |
| Storage hopper | 150 / 240 / 440 liters |
Installation
Installation, hydraulic connection, electrical connection, and chimney connection must be carried out by appropriately qualified specialist personnel. The return temperature must not fall below 55 °C; the supplied TV kit is provided for this purpose.
At least 800 mm of operating space must be provided in front of the boiler. At least 800 mm is required on the side of the storage hopper, at least 500 mm on the opposite side, and at least 600 mm of free space above the boiler. Behind the variants with 150- and 240-liter hoppers, at least 500 mm must be planned, and behind the 440-liter version, at least 600 mm.
The chimney and flue gas system must be matched to the pellet boiler. For the SmartFire SF15, the product-specific technical data specifies a required chimney draft of 5 to 10 Pa.
Notes
The standard version does not have automatic heat exchanger cleaning. The heat exchanger is regularly cleaned via the mechanical cleaning mechanism. The automatic mechanical cleaning of the pellet burner operates independently of this.
The SF15 standard version is not to be equated with the separately documented SF15/3-bar model. This article refers to the standard version with a maximum operating pressure of 1.5 bar.
The sizing of the boiler output, heating surfaces, domestic hot water preparation, chimney, and hydraulics must be based on the specific heating system and the actual heat demand.
Scope of delivery
- HKS Lazar SmartFire SF15 Standard pellet boiler 15 kW
- Storage hopper 150, 240, or 440 liters depending on the selected variant
- Hydraulic kit TV kit
- Ash drawer
- 3 temperature sensors for the central heating system
- Installation and operating instructions
- Control instructions
