Gas
Low-NOx Gas Storage Water Heater – PLUS Series
- Thermal efficiency up to 98%
- NOx < 30 mg/m³
- 400 L tank
Gas
Commercial Low-NOx Condensing Gas Storage Water Heater – PRO Series
A condensing, fully premixed gas storage water heater with a 379 L enamel tank for hotels, apartments, clubs and industrial facilities that need high-efficiency, low-emission domestic hot water.
- Thermal efficiency ≥107%
- NOx < 30 mg/m³
- 30–99 kW
- Indoor & outdoor (IPX4)
Key features
Efficiency
Top-mounted PRE-MIX full premix combustion with a TRIPLE-HEAT three-pass heat exchanger, rated at up to 107% thermal efficiency.
Safety
Electric spark ignition with low-load start-up. Four layers of protection: thermostat, high-temperature limit, over-temperature protection and T&P valve. Pressure rating up to 1.1 MPa.
Smart control
LCD display for real-time status and fault alerts. Wi-Fi connectivity for remote monitoring and parameter settings from a mobile device.
Low emissions
NOx emissions below 30 mg/m³. A built-in condensate neutralizer reduces the acidity of the condensate before discharge.
Installation
Indoor or outdoor installation with forced or balanced flue options, plus multiple water connection points for flexible layouts and easy replacement of existing equipment.
Technical specifications
Indoor models (RSTQ)
| Model | RSTQ30-379L | RSTQ58-379L | RSTQ73-379L | RSTQ85-379L | RSTQ99-379L |
|---|---|---|---|---|---|
| Storage capacity (L) | 379 | 379 | 379 | 379 | 379 |
| Thermal efficiency | ≥107% | ≥107% | ≥107% | ≥107% | ≥107% |
| Rated heat input (kW) | 30 | 58 | 73 | 85 | 99 |
| Rated heat input (kcal/h) | 25,800 | 50,200 | 62,440 | 72,704 | 85,646 |
| Gas consumption (m³/h) | 3.0 | 5.8 | 7.3 | 8.5 | 9.9 |
| Electric power (W) | 50 | 72 | 120 | 160 | 180 |
| Rated working pressure (MPa) | 1.1 | 1.1 | 1.1 | 1.1 | 1.1 |
| Temperature setting range (°C) | 30–75 | 30–75 | 30–75 | 30–75 | 30–75 |
| Hot water output at Δt = 25 °C (L/h) | 1,109 | 2,144 | 2,678 | 3,118 | 3,673 |
| Hot water output at Δt = 35 °C (L/h) | 792 | 1,532 | 1,913 | 2,227 | 2,623 |
| Hot water output at Δt = 55 °C (L/h) | 504 | 975 | 1,217 | 1,326 | 1,670 |
| Inlet/outlet pipe diameter | DN50 | DN50 | DN50 | DN50 | DN50 |
| Gas connection | DN20 | DN20 | DN20 | DN20 | DN20 |
| Safety valve / drain valve | DN25 / DN50 | DN25 / DN50 | DN25 / DN50 | DN25 / DN50 | DN25 / DN50 |
| Air intake / flue outlet diameter | Φ110 / Φ110 | Φ110 / Φ110 | Φ110 / Φ110 | Φ110 / Φ110 | Φ110 / Φ110 |
| Net weight (kg) | 345 | 349 | 355 | 355 | 355 |
| Dimensions: total height / outlet height / inlet height (mm) | 2000 / 1730 / 460 | 2000 / 1730 / 460 | 2000 / 1730 / 460 | 2000 / 1730 / 460 | 2000 / 1730 / 460 |
| Body diameter / max. depth (mm) | 710 / 790 | 710 / 790 | 710 / 790 | 710 / 790 | 710 / 790 |
Outdoor models (RSTW)
| Model | RSTW30-379L | RSTW58-379L | RSTW73-379L | RSTW85-379L | RSTW99-379L |
|---|---|---|---|---|---|
| Note | Same performance data, connections, weights and dimensions as the indoor models above | ||||
| Waterproof rating | IPX4 | IPX4 | IPX4 | IPX4 | IPX4 |
Data as published by OTTMEL. Specifications may change; please confirm the current datasheet with our sales team before ordering. Gas type, voltage and other market-specific requirements should be confirmed for each project.
Typical applications
- Hotels
- Apartments
- Clubs
- Industrial facilities
- Schools (see project references)
- Elderly care centers (see project references)
Related products
Gas
Commercial Gas Storage Water Heater – CLASSIC Series
- 22–99 kW
- 220–360 L tanks
- Pressure rating 1.1 MPa
Gas
Condensing Premix Storage Fire-Tube Boiler
- 240–700 kW
- NOx 22.3–24.7 mg/m³
- Modulation up to 12:1
Need this model for a project or distribution line?
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