Gas
Low-NOx Condensing Gas Storage Water Heater – PRO Series
- Thermal efficiency ≥107%
- NOx < 30 mg/m³
- 30–99 kW
Factory in Dongying, Shandong, China · Since 1994
Commercial Water Heater & Condensing Boiler Manufacturer
OTTMEL designs and manufactures commercial gas and electric water heaters and boilers for hotels, schools, hospitals and industrial facilities, and supplies B2B partners from our factory in Dongying, China.
For distributors, importers, HVAC suppliers, MEP contractors and OEM brand owners.
1994Founded (formerly Shandong Precision Boiler Import & Export Co., Ltd.)
8Commercial product families, gas and electric
6.4–2,800 kWPublished output range across the product line
< 30 mg/m³NOx on our premix low-NOx and condensing models
Product families
Published specifications for every model, to support distributor stock decisions and project specification.
Gas water heaters & condensing boilers
Gas
Low-NOx Gas Storage Water Heater – PLUS Series
- Thermal efficiency up to 98%
- NOx < 30 mg/m³
- 400 L tank
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
Gas
Stainless Steel Condensing Direct-Flow Boiler
- Efficiency up to 107%
- NOx ≤ 25 mg/m³
- Modulation up to 10:1
Electric water heaters & boilers
Electric
Commercial Electric Storage Water Heater
- 6.4–90 kW
- 320–500 L
- BLUE-ARMOR enamel tank
Electric
Commercial Electric Boiler (Large Storage)
- 180–720 kW
- 495–1,150 L
- Grouped heating control
Electric
Floor-Standing Electric Heating Boiler
- 12–99 kW
- Thermal efficiency > 98%
- 380V/50Hz
Why work with OTTMEL
Manufacturer, not a trader
We have produced commercial hot water and heating equipment since 1994. Production equipment includes enamel lines, CNC punching, laser cutting, CNC bending, robotic welding and electrophoretic coating.
Enamel tank technology
Water heater tanks use Baosteel BTC340R enamel steel with a double-layer BLUE-ARMOR enamel coating, applied after sandblasting and followed by pressure testing.
Low-NOx, high-efficiency range
Full premix combustion keeps NOx below 30 mg/m³ on our low-NOx models, and condensing models are rated at up to 107% thermal efficiency.
Complete technical data
Each product page lists capacity, heat input or power, hot water output, connection sizes, dimensions and weights, so you can specify and compare models.
Project references
Our equipment supplies hot water in hotels, schools, elderly care centers and healthcare facilities across China. See the project list.
2-year warranty
Our products carry a 2-year warranty. Contact us for the warranty terms that apply to your market.
Looking for a commercial water heater supplier?
Send us your product interest, target country and estimated quantity. Customization for OEM partners can be discussed.