Laars JX125N Gas-Fired Residential Hydronic Boiler - 125 MBTU/h

125,000 BTU Output - 84% eff.
1-1/4" Water Connections
3/4" Gas
Low Water Cutoff,
Outdoor Reset,
LESS PUMP

Brochure
Installation Manual
Warranty 
User Manual

Exceptional Value | High Performance

The Laars Mini-Therm® JX is a reliable gas-fired residential boiler with plenty of capacity to keep even the largest home comfortable on the coldest days.  The compact boiler has an efficient low-mass heat exchanger and a super-quick heating response to deliver years of warmth and comfort to your home.

• Reliable Heating with a 20 Year Warranty
• Energy Saving "Economy Mode" Built-In with the Mini-Therm JX Control
• Environmentally Friendly
• Simple Retrofit with Standard Tapping Locations
• Longg Life Hybrid Heat Exchanger
• Designed and Built at the Laars Headquarters in Rochester, NH USA

Benefits of Copper & Cast Iron

• The Mini-Therm JX has a unique, field-proven heat exchanger design that intelligently combines finned copper tubing with cast iron "wet walls" to create a perfect balance of quck heat transfer and stored heat.
• Copper transfers heat up to 7x faster than cast iron for a faster heating response
• Cast iron wet walls store excess heat to minimize short cycling - increasing efficiency and heat exchanger life
• Mini-Therm JX is smaller and lighter than traditional cast iron boilers making installation and maintenance much easier

Low Loss Header System

• Maintains the correct temperature rise (Delta-T) across the heat exchanger - offering improved performance and longer heat exchanger life
• Protects the heat exchanger from low return water temperatures  (Economy Mode or Outdoor Reset)
• System pump interrupt for anit-condensing feature
• Allows for direct replacement of traditionally piped cast iron boilers
• Reduces installation time resulting in savings

Benefits of Copper & Cast Iron

• The Mini-Therm JX has a unique, field-proven heat exchanger design that intelligently combines finned copper tubing with cast iron "wet walls" to create a perfect balance of quick heat transfer and stored heat.
• Copper transfers heat up to 7x faster than cast iron for a faster heating response
• Cast iron wet walls store excess heat to minimize short cycling - increasing efficiency and heat exchanger life
• Mini-Therm JX is smaller and lighter than traditional cast iron boilers making installation and maintenance much easier

Laars Low Loss Header System

• Maintains the correct temperature rise (Delta-T) across the heat exchanger - offering improved performance and longer heat exchanger life
• Protects the heat exchanger from low return water temperatures
• Allows for direct replacement of traditionally piped cast iron boilers