Miura EX Gas/Oil Series High Pressure Steam Boilers

Miura has built an international reputation for environmentally responsible engineering and highly efficient boiler technology. The EX Gas/Oil Series High Pressure Steam Boiler stands out as one of the most adaptable industrial steam systems available today.

The EX configuration is engineered to reduce carryover and deliver exceptionally dry steam — over 99% saturated — in under five minutes from a cold start. Rapid startup reduces fuel consumption, lowers operating costs, and supports more sustainable energy use.

• Dual-fuel capability: Natural Gas, Propane, or #2 Fuel Oil

• High-pressure configurations available (300 MAWP, 250 MAWP, or 170 MAWP)

• Certain models offered as hot water boilers (see product catalog for details)

• Low emissions performance, with NOx levels as low as 30 ppm depending on model

EX Series Model Design

The MIURA EX Series incorporates vertically aligned tubes positioned between two rectangular headers. These headers are surrounded by cast refractory material, exposing only the tubes to direct flame and combustion gases.

The upper header connects to the lower header solely through the tubes, allowing both to move vertically as thermal expansion and contraction occur during operation.

This “floating header” arrangement substantially reduces structural stress and makes it possible to introduce cold feedwater without risking severe thermal shock. Common leakage issues found in conventional firetube and bent watertube boilers are largely avoided through this approach.

Ultra Compact Design Saves Space and Costs

EX Series boilers require roughly one-third less floor area than comparable firetube units and eliminate the need for clearance space to remove tubes during maintenance. The smaller footprint also reduces radiant heat losses, which contributes to improved fuel efficiency and lower operating expenses.

Full Steam Output In Less Than 5 Minutes

Thanks to the floating header design, MIURA boilers can reach full steam production in less than five minutes from a cold start. Traditional firetube boilers often need 60 to 90 minutes to achieve the same output. Faster startup translates directly into energy savings and improved operational flexibility.

Dry Steam

The MIURA EX system is designed to minimize moisture carryover, producing steam that is more than 99% saturated through a three-stage separation process:

• Primary separation within the tubes

• Secondary separation in the upper header using a baffle plate

• Final moisture removal through a cyclone separator

Early Warning Scale Monitor

Mineral scale accumulation is a persistent issue in boiler systems and typically results from inadequate feedwater treatment. Even a thin layer of scale can act as an insulating barrier, reducing efficiency by approximately 10% while increasing fuel consumption and the likelihood of equipment damage.

Every EX Series unit includes a thermocouple mounted directly on a tube surface. If scale begins to form, the system alerts operators immediately, enabling corrective action before serious performance losses occur. Removing the buildup restores original efficiency and can prevent substantial repair and fuel costs.

Unbeatable In-Service Efficiencies

Using advanced computer-assisted engineering, Miura optimizes heat transfer surfaces while maintaining a low water volume, achieving fuel-to-steam efficiencies around 85%. Conventional firetube boilers may reach approximately 83% under ideal conditions, but real-world operation often tells a different story. In practice, MIURA systems commonly deliver 10% to 40% lower fuel consumption compared to standard firetube designs, due to reduced standby losses and rapid startup performance. For application-specific performance data, consult a local Miura representative.