LTV/LTS

Low Intensity Gas Infrared Radiant Tube Heater

This product page covers Keywarm’s low-intensity tube radiant heating paths, including LTV (vacuum system) and LTS (positive pressure system). These systems are suitable for factories, warehouses, workshops and high-bay buildings that require radiant heating with clearer whole-zone layout logic.

What Are Low-Intensity Tube Radiant Heating Systems?

Low-intensity tube radiant heating systems transfer heat by means of radiant tubes and are commonly used in factories, warehouses, workshops and other industrial buildings. Compared with high-intensity ceramic radiant heaters, they provide a different radiant layout logic and are more suitable for projects that seek larger-zone radiant coverage.

Who Are These Systems More Suitable For?

These systems are more suitable for projects that want radiant heating but require a larger heating layout range, more organized system routing and a clearer radiant heating logic across the building. They are commonly considered in factories, warehouses and workshops, especially in high-bay industrial buildings.

When Should You Consider These Systems First?

They should be considered first when a project prefers radiant heating over warm-air heating, but the focus is not only on a single local work zone. Instead, the project needs a broader radiant layout path across the building and a more structured radiant heating solution.

Core Advantages

Better for Larger Radiant Coverage

These systems are more suitable for projects that need radiant heating over a larger area rather than only a limited local zone.

Better for Continuous Radiant Layout

The radiant tube path is suitable for projects that expect clearer layout logic and more organized system routing.

Better for High-Bay Radiant Heating Logic

In high-bay factories and warehouses, low-intensity radiant systems better match the logic of direct heat delivery with reduced dependence on whole-space warm-air coverage.

Compared with High-Intensity Radiant Heaters, They Follow a Different Radiant Path

Compared with HTC, these systems are based on radiant tubes and provide a different technical and layout path for radiant heating.

Strong Dependence on Building Safety Conditions, Especially for Indoor Gas Piping Solutions

Where the burner and gas piping remain indoors, more attention is required for gas safety, building fire conditions and ventilation logic.

A Quick Comparison of the Two Technical Paths

Under the same low-intensity tube radiant heating logic, the main difference between LTV and LTS lies in their system organization methods.

LTV (Vacuum System)

LTV is based on a vacuum-type radiant tube system. It is suitable for projects that prefer a low-intensity radiant path with vacuum-system logic and clearer exhaust organization.

LTS (Positive-Pressure System)

LTS is based on a positive-pressure radiant tube system. It is suitable for projects that prefer a low-intensity radiant path with positive-pressure system logic and direct equipment arrangement.

Typical Applications

Factory & Workshop Applications

Suitable for production workshops, processing plants, and various industrial factory buildings, focusing on large-area radiant coverage, establishment of overall work-area thermal environments, and continuous heating performance. For projects prioritizing overall building radiant heating logic rather than high-intensity heating for isolated areas, these systems provide significant application value.

Warehouse & Logistics Building Applications

Suitable for warehouses, logistics buildings, and industrial projects requiring balanced radiant heating effects in high spaces, focusing on heat utilization logic for the main building space and more continuous thermal environment performance. For projects that do not wish to rely solely on warm air coverage, these systems are highly recommended for evaluation.

Large-Space Overall Radiant Heating Applications

Suitable for industrial applications intending to adopt overall radiant heating solutions in large spaces. For projects focusing on large-area heat distribution, installation height compatibility, and overall radiant heating logic in industrial buildings, these systems are well suited for preliminary comparison.

The application descriptions on the webpage are intended for preliminary evaluation. Actual equipment quantity, installation position, installation height, exhaust arrangement, and operating parameters should be further assessed according to project conditions.

How to Understand Vacuum and Positive-Pressure Systems

Both LTV and LTS belong to low-intensity tube radiant heating systems, but they follow different technical paths. LTV is organized as a vacuum system, while LTS is organized as a positive-pressure system. In project selection, the decision is not simply based on “which one is better”, but on system routing, building conditions, installation preferences, exhaust arrangement and project habits.

Quick Comparison

LTV Models, Technical Data and Installation Documents

LTV is suitable for projects seeking large-area, balanced radiant heating effects in high-space buildings while adopting a vacuum-system heating organization approach. In practical projects, LTV also typically involves indoor gas pipeline installation and requires gas leakage alarm systems and emergency shut-off devices in accordance with regulations, resulting in higher requirements for building fire protection, indoor safety conditions, and maintenance management. If indoor exhaust discharge is adopted, the project must also meet forced ventilation requirements. However, in some projects, LTV can connect multiple units in parallel with a shared vacuum pump fan to discharge exhaust gases outdoors collectively, making its exhaust arrangement more flexible than typical indoor discharge systems.

Product Specifications

Installation Diagram

LTS Models, Technical Data and Installation Documents

LTS is suitable for projects seeking large-area, balanced radiant heating effects in high-space buildings while adopting a positive-pressure system heating organization approach. For applications preferring positive-pressure system logic and seeking clear system organization within the overall radiant heating solution, LTS generally provides strong preliminary evaluation value. Similar to other indoor combustion equipment systems, the adoption of LTS should also be evaluated comprehensively according to building fire protection levels, indoor safety conditions, gas leakage alarm systems, emergency shut-off devices, and project ventilation and exhaust conditions.

Product Specifications

Installation Diagram

How These Systems Differ from HTC / BP-LTVU / WAB

Difference from HTC

HTC is a high-intensity ceramic radiant heater, while LTV/LTS are low-intensity tube radiant heating systems. They follow different radiant paths and suit different project logics.

Difference from BP-LTVU

BP-LTVU places the heat generator outdoors in most typical projects, which helps keep the gas train, combustion air and flue discharge outside the building. LTV/LTS more often involve indoor system layout logic, depending on project configuration.

Difference from WAB

WAB is an indirect-fired warm air heater intended for whole-space warm-air coverage, while LTV/LTS are radiant heating systems intended for radiant heating logic.

Different heating solutions are not simply a matter of “which is better,” but rather which is more suitable for different building objectives, heat utilization logic, safety requirements, and operating conditions.

Frequently Asked Questions

Q: What applications are low-intensity tube radiant heating systems more suitable for?

A：They are suitable for factories, warehouses, workshops, and other large-space building applications, especially projects focusing on large-area radiant coverage, continuous thermal environment establishment, and overall radiant heating logic.

Q: What is the main difference between LTV and LTS?

A：The main difference lies in the system organization method. LTV adopts a vacuum-system approach and, in some projects, can achieve centralized exhaust discharge through multiple parallel units sharing a vacuum pump fan. LTS adopts a positive-pressure system approach. Both are suitable for overall radiant heating in large spaces, but their project adaptation logic differs.

Q: What is the core difference between LTV and HTC?

A： LTV focuses more on low-intensity radiant heating, emphasizing large-area and balanced radiant coverage. HTC focuses more on high-intensity radiant heating, emphasizing localized work-area heating and rapid thermal comfort establishment.

Q: What is the main difference between low-intensity tube radiant heating and warm air heating?

A：Low-intensity tube radiant heating emphasizes establishing a more continuous and balanced thermal environment through radiant heat transfer, while warm air heating focuses on establishing the thermal environment through warm air coverage.

Q: Why do these systems require careful evaluation of building safety conditions?

A：Because these systems typically involve indoor gas pipeline installation and require gas leakage alarm systems and emergency shut-off devices according to regulations, they generally impose higher requirements for building fire protection, indoor safety conditions, and maintenance management compared with some outdoor generator-based systems.

Q: Why is LTV more flexible in some projects?

A：Because in some projects, LTV can connect multiple units in parallel with a shared vacuum pump fan to discharge exhaust gases outdoors collectively, making its exhaust arrangement more flexible than typical indoor discharge systems.

Q: Why are all specifications and drawings not directly displayed on the webpage?

A：Because projects vary greatly in building height, installation conditions, space usage, exhaust arrangements, and operating methods. Website content is more suitable for preliminary evaluation, while detailed specifications, dimensions, and installation materials are better obtained through project communication.

Q: What materials can Keywarm provide?

A：According to project requirements, Keywarm can provide one-page PDFs, product manuals, specification documents, and additional installation and product selection support.

Q: If I am still unsure whether to choose LTV or LTS, what information should I provide first?

A：It is recommended to provide basic information such as building type, dimensions, height, space usage, target areas, fuel conditions, exhaust arrangements, and operating methods. Based on this, we can assist with a preliminary evaluation closer to the actual application scenario.

Documentation and Technical Support

For further comparison between the LTV and LTS system approaches, or to proceed with project discussions, related materials and technical support are available upon request.

Download Product Comparison Materials