What is the maximum steam pressure the SpiraHeat can handle?

The SpiraHeat is rated for a maximum saturated steam supply pressure of 145 psi g (10 bar g) to the heat exchanger.

Can I use the SpiraHeat in outdoor or hazardous environments?

No. The system is rated IP54 and is not suitable for use in explosive or corrosive atmospheres, or at altitudes above 6500 ft (1981 m). It requires an ambient temperature range of 32°F to 131°F.

What is the difference between pneumatic and electric actuation options?

Pneumatic actuation (PN) requires a compressed air supply of 20–85 psi g and is typically preferred in plants with existing instrument air infrastructure. Electric actuation (EL) uses a 24 Vac supply and may be simpler where air supply is unavailable, though some EL models have a reduced IP31 rating.

Does the SpiraHeat come with safety high-limit controls?

No, Independent High Limit (IHL) control equipment is not included as standard. If your application or local regulations require IHL, it must be added separately. Contact PC Engineering for guidance.

How is the system sized for my application?

Each SpiraHeat is engineered for specific heat load requirements. Provide your duty parameters (steam pressure, water flow rate, temperature rise) to PC Engineering, and our team will work with Spirax Sarco to recommend the correct heat exchanger size and control valve Cv.

SPIRAX SARCO · HEAT TRANSFER SYSTEMS

Spirax SpiraHeat Process Controller Based Compact Steam-to-Water Heat Transfer System

Name: Spirax SpiraHeat Process Controller Based Compact Steam-to-Water Heat Transfer System
Brand: Spirax Sarco

Spirax SpiraHeat compact steam-to-water heating system for industrial process heating. 0.1-4.9 MMBtu/hr capacity. Get quotes from PC Engineering.

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Spirax SpiraHeat Compact Heat Transfer System

Overview

The Spirax SpiraHeat is a pre-assembled, compact steam-to-water energy transfer system designed for industrial heating applications. With a nominal capacity range of 0.1 to 4.9 MMBtu/hr, this packaged unit converts steam energy into hot water for process heating or building HVAC systems.

The system operates by modulating steam flow through a pneumatic or electric actuated control valve to match heat demand precisely. A fast-response Pt100 temperature sensor paired with a process controller maintains accurate water temperature output, making it suitable for applications with steady and predictable load conditions.

Each SpiraHeat unit arrives factory-assembled on a compact frame and baseplate, with all control equipment pre-wired and piped. This reduces installation time and ensures matched performance between the heat exchanger and temperature control components.

Key Features

Compact, skid-mounted design for easy installation with forklift
Stainless steel heat exchanger precisely engineered for specific duty requirements
Choice of pneumatic or electric valve actuation
Pt100 temperature sensor with process controller for accurate temperature maintenance
Pre-wired control panel with push-button access to system parameters
Optional condensate control for improved energy efficiency and reduced CO₂ emissions
Carbon steel pipework fabricated with approved welding procedures
Flanged connections for reliable operation and easy maintenance

Specifications

Parameter	Value
Capacity Range	0.1 – 4.9 MMBtu/hr
Pipework Design Condition	ASME 125
Max. Steam Supply Pressure	145 psi g (10 bar g)
Max. Secondary Pressure	145 psi g (10 bar g)
Max. Secondary Temperature	230°F (110°C)
Max. Steam Temperature	363°F (184°C)
Ambient Operating Temperature	32°F to 131°F (0°C to 55°C)
Relative Humidity	5 – 85% non-condensing
IP Rating	IP54 (IP31 for some EL option systems)
Electrical Supply	110–240 Vac / 50–60 Hz
Supply Fuse	5A (T)
Electric Actuator Supply	24 Vac / 50–60 Hz
Pneumatic Supply	20 – 85 psi g (1.4 – 5.9 bar g)
Heat Exchanger Material	Stainless steel
Steam/Condensate Pipework	Carbon steel
Steam Control Valve & Trap	Cast iron
Regulation Conformance	ASME pressure equipment standards, UL508A (control panel)

Applications

The Spirax SpiraHeat is suitable for a range of industrial and commercial heating applications:

- Process hot water generation in manufacturing plants - Building heating systems in factories, warehouses, and commercial facilities - HVAC hot water supply in industrial complexes - Washdown water heating for food processing and pharmaceutical plants - Pre-heating applications in textile, paper, and chemical industries

Note: The unit does not include Independent High Limit (IHL) control equipment. If required for your application, this must be specified and added separately.

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Frequently Asked Questions

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Contact PC Engineering for pricing, availability, and technical support for the Spirax SpiraHeat Compact Heat Transfer System. Call us or fill in our inquiry form — our engineers will respond within 24 hours.

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