High-Efficiency Hydronic Boilers for Radiant Heat

HYDRONIC BOILERS

High-Efficiency Boilers built for reliable heat

Control and balance water flow across every heating loop with professional-grade stainless steel manifolds. Available in multiple loop configurations for radiant heating and snow-melting system.

Lochinvar (NG) NKB199N Noble Fire Tube Boiler | 199,000 BTU High Efficiency

Lochinvar (NG) NKC150N Noble Fire Tube Boiler | 150,000 BTU High Efficiency

Lochinvar NKC199N Noble Combi Boiler | 199,000 BTU High Efficiency

Lochinvar (NG) NKC110N Noble Fire Tube Boiler | 110,000 BTU High Efficiency

Lochinvar (NG) NKB110N Noble Fire Tube Boiler | 110,000 BTU High Efficiency

Lochinvar (NG) NKB150N Noble Fire Tube Boiler | 150,000 BTU High Efficiency

Hydronic Heating Solutions

High-Efficiency Boilers for Hydronic Radiant Floor Heating

Warming Systems offers high-efficiency boilers designed for hydronic radiant floor heating, snow melting systems, baseboard heating, and whole-home comfort. Our boiler selection includes compact, wall-mounted condensing models engineered to deliver dependable heating performance with excellent energy efficiency.

Whether your project requires a heating-only boiler or a combi boiler that provides both space heating and domestic hot water, our boiler collection offers flexible solutions for residential hydronic heating applications.

Boilers for Radiant Floor Heating Systems

Hydronic radiant floor heating systems rely on a dependable heat source to circulate warm water through tubing beneath the floor. High-efficiency condensing boilers are well suited for radiant heat applications because they offer efficient low-temperature operation, compact installation, durable heat exchanger construction, and precise temperature control.

Why Choose a High-Efficiency Boiler?

High-efficiency condensing performance for reduced energy use
Ideal heat source for hydronic radiant floor heating systems
Durable heat exchanger construction for reliable operation
Compact wall-mounted designs save mechanical room space
Suitable for radiant floors, baseboard heat, hydro-air, and snow melting
Available in heating-only and combi boiler configurations

Boiler Sizing Rule of Thumb

For a rough residential heating estimate, many standard homes use approximately 30 to 50 BTU per square foot of floor space. This provides a starting point when comparing boiler sizes.

For example, a 2,000 sq. ft. home may require approximately 60,000 to 100,000 BTU/hr of heating capacity, depending on the home’s insulation, layout, climate zone, construction, and overall heat loss.

This is only a general guideline. Final boiler sizing should be based on a proper heat loss calculation performed by a qualified installer or heating professional.

High-altitude applications: Altitude ratings vary by manufacturer and model. The Lochinvar boilers currently listed are rated for installations up to 4,500 feet. For high-altitude requirements, call 1-800-663-7831 before ordering.

Boiler Model Comparison

Model	Brand	BTU Input	Type	Fuel	Best For
NKB150N	Lochinvar Noble	150,000 BTU	Heating Only	Natural Gas	Radiant floor heating and hydronic heating systems
NKC150N	Lochinvar Noble	150,000 BTU	Combi Boiler	Natural Gas	Radiant heating plus domestic hot water
NKB199N	Lochinvar Noble	199,000 BTU	Heating Only	Natural Gas	Larger radiant and hydronic heating applications
NKC199N	Lochinvar Noble	199,000 BTU	Combi Boiler	Natural Gas	Larger heating applications with domestic hot water needs

Heating-Only Boiler vs. Combi Boiler

Heating Only

Heating-Only Boiler

A heating-only boiler is designed to provide space heating for radiant floor systems, baseboard heating, panel radiators, hydro-air systems, or hydronic snow melting.

This is a strong option when domestic hot water is supplied by a separate water heater or indirect storage tank.

Heating + Hot Water

Combi Boiler

A combi boiler provides both space heating and domestic hot water from one compact appliance.

This can save mechanical room space and simplify the system for homes that need both hydronic heat and on-demand hot water production.

Frequently Asked Questions

How many BTUs do I need to heat my home?

A common rough estimate is 30 to 50 BTU per square foot for a standard residential home. A 2,000 sq. ft. home may need approximately 60,000 to 100,000 BTU/hr, but the final boiler size should be determined by a professional heat loss calculation.

What type of boiler is best for radiant floor heating?

A high-efficiency condensing boiler is often a strong choice for radiant floor heating because radiant systems typically operate at lower water temperatures. This can help the boiler operate efficiently while providing consistent comfort.

What is the difference between a boiler and a combi boiler?

A heating-only boiler provides space heating. A combi boiler provides both space heating and domestic hot water from one appliance.

Can these boilers be used for snow melting systems?

Many hydronic boilers can be used as the heat source for a properly designed snow melting system. Boiler suitability and sizing should be confirmed based on the system design, outdoor conditions, fluid requirements, and calculated heat load.

What size boiler do I need?

Boiler sizing depends on the building’s heat loss, square footage, insulation, climate, construction, tubing layout, design water temperature, and domestic hot water demand when selecting a combi boiler. A professional heat loss calculation is recommended before selecting a model.

Which boiler brands does Warming Systems carry?

Our current boiler collection includes Lochinvar Noble boilers. Available manufacturers and models may change as we continue expanding our hydronic heating product selection.