Danfoss XB12L-1 20 brazed plate heat exchanger, G 1", 20 plates, PN 25
- Application: primary/secondary loop separation — district heating, DHW, space heating
- Heat capacity: ~15-30 kW (depending on flow rate and ΔT)
- Nominal pressure: PN 25 (25 bar)
- Connection: G 1" external thread (ISO 228/1, S1-S4)
Where XB12L-1 20 is used
The XB12L-1 20 is designed for small residential substations, single-family houses and townhouses requiring up to ~30 kW capacity. It is used as a primary/secondary loop separation exchanger in district heating (DH) connection points or as part of modular DHW systems. Its compact 289 × 118 mm footprint fits even in the smallest technical rooms.
The brazed gasket-free construction requires no periodic disassembly maintenance. The "L" in the name denotes a low plate chevron angle — reduced pressure drop, ideal for residential systems with limited pump head and longer service intervals.
Technical specifications
| Parameter | Value |
|---|---|
| Code | 004H7662 |
| EAN | 5702425109676 |
| Series | Danfoss XB12L |
| Model | XB12L-1 20 (single-pass) |
| Number of plates | 20 |
| Plate pattern | L — low chevron angle (lower pressure drop) |
| Nominal pressure (PN) | 25 bar (both sides) |
| Media temperature range | −196 °C to +180 °C |
| Connection | G 1" external thread, ISO 228/1 (S1-S4) |
| Plate material | Stainless steel 1.4404 (AISI 316L) |
| Brazing filler | Copper |
| Dimensions (H × W) | 289 × 118 mm (without feet) |
| Volume per channel | 0.045 L |
| Net weight | ~2.91 kg |
| Construction | Brazed, hermetic (gasket-free) |
| Media | Water, glycol solutions up to 50 %, media compatible with AISI 316L and copper brazing |
| Certification | PED, EU RoHS |
Heat transfer capacity — quick calculation
Capacity depends on flow rate, ΔT and logarithmic mean temperature difference (LMTD). General formula: P = Q × ΔT × 1.163 (kW, Q m³/h, ΔT °C).
Example for heating mode (primary 80/60 °C → secondary 55/35 °C): at Q = 0.8 m³/h and effective ΔT ≈ 20 °C → P ≈ 18 kW. With Q = 1.2 m³/h and ΔT ≈ 20 °C → P ≈ 28 kW.
When to choose XB12L-1 20
- Single-family house and townhouse substations (~15-30 kW)
- Small residential DH user branches with limited flow
- DHW preheat systems
- When PN 25 high-pressure rating is required in a compact housing
B2B delivery and logistics via Amegata.lt
- 24-hour delivery across Lithuania (from our warehouse in Vilnius)
- Competitive B2B pricing — often below market average
- 30-day payment terms for companies (per contract)
- Free technical consultation for sizing selection
Official Danfoss catalogue: store.danfoss.com/XB12L-1 20
Frequently asked questions
What does "L" mean in XB12L?
"L" denotes a low plate chevron angle — lower heat transfer coefficient but also lower pressure drop. The "H" (High) variant has a higher coefficient but higher Δp. "L" suits residential systems with limited pump head.
What is the difference between XB12L-1 and XB12L-2?
"-1" is a single-pass configuration with the standard 4-connection layout. "-2" is a two-pass version designed for specific DHW systems requiring higher temperature efficiency or connections routed on a single side.
Can glycol mixtures be used?
Yes. The XB12L series is compatible with ethylene glycol and propylene glycol solutions up to 50 %, when appropriate inhibitors are used. For DHW — only potable-grade fluids allowed.
What maintenance is required?
The brazed gasket-free construction requires no periodic disassembly maintenance. Only CIP flushing every 3-5 years is recommended if fouling signs appear (rising pressure drop or falling heat transfer).
Is it suitable for regions with aggressive water?
In some regions, district heating water contains elevated chlorides or ammonia — in such systems, copper brazing may shorten the exchanger's service life. In these cases we recommend Danfoss XB variants with stainless steel brazing or an alternative (AlfaNova). For hard water with elevated Ca/Mg carbonate content, limescale gradually builds up on the plates and reduces heat-transfer efficiency; for such systems gasketed (plate-and-frame) exchangers are preferable, as they can be periodically opened for mechanical or CIP cleaning. Contact us — we will select the best model for your water conditions.
