Miura LX Series Low NOx Steam and Hot Water Boilers

LX Series Models

Miura has earned global recognition for prioritizing environmental responsibility while engineering advanced, high-performance boiler systems. Its low-NOx steam and hot water units comply with — and often surpass — both existing and anticipated nitrogen oxide emission standards, achieving levels as low as 9 ppm NOx at 3% corrected O₂.

• Gas-fired using Natural Gas or Propane

• Available in high- and low-pressure steam configurations (300 MAWP, 170 MAWP, or 15 MAWP)

• Select models offered as hot water boilers

• Compact footprint — the LX-200 can pass through a standard doorway

• Intrinsically low nitrogen oxide emissions, with ratings down to 9 ppm depending on configuration

LX Series Model Design

The LX Series utilizes a vertical tube arrangement positioned between two rectangular headers. These headers are embedded within cast refractory material, leaving only the tubes directly exposed to flame and combustion flow. The upper header connects to the lower header exclusively through the tubes themselves, allowing both to move vertically as thermal expansion and contraction occur.

This “floating header” architecture significantly reduces mechanical stress and enables the safe introduction of cold feedwater without risking severe thermal shock. Issues common to traditional firetube and bent watertube boilers — such as tube leakage — are effectively minimized by this design.

Low-NOx “No Furnace” Boiler

Instead of a conventional furnace chamber, combustion occurs as a broad, cool flame that envelops the tube surfaces. Because the flame spreads across a wide area, the burn is controlled and uniform, producing exceptionally low NOx emissions while maintaining high thermal efficiency in a compact package.

Full Steam Output in Under Five Minutes

The floating header configuration allows for rapid heating and minimal thermal inertia. From a cold start, Miura boilers can deliver full steam output in under five minutes. Traditional firetube boilers typically require 60 to 90 minutes to reach operating conditions. This rapid startup translates directly into meaningful reductions in fuel consumption and operational downtime.

Smaller Footprint, Greater Capacity

LX Series boilers occupy roughly half the floor space of comparable firetube units and eliminate the need for clearance to pull tubes during maintenance. Facilities can either double steam capacity within the same footprint or reduce required space in new installations. The compact form also lowers radiant heat losses, contributing to improved overall fuel efficiency.

Integrated Scale Detection System

Mineral scale buildup is a common challenge in steam generation systems, typically resulting from inadequately treated feedwater. Even a thin layer — comparable to an eggshell — can reduce efficiency by around 10%, driving up fuel costs and increasing the risk of equipment damage.

Each LX Series unit includes a built-in thermocouple mounted directly to a tube surface. If scale begins to accumulate, the system alerts operators immediately, enabling corrective action before significant efficiency loss occurs. Removing the buildup restores performance and can prevent costly repairs and excessive fuel usage.

Outstanding Real-World Efficiency

Using computer-optimized heat transfer surfaces and low water volume, Miura achieves fuel-to-steam efficiencies of approximately 85%. Conventional firetube boilers may reach up to 83% under ideal conditions, yet in day-to-day operation Miura systems often realize 10% to 40% lower fuel consumption. The difference stems from faster startup, reduced standby losses, and more efficient heat utilization. For detailed performance comparisons tailored to specific applications, consult an authorized Miura representative.