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
Long 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 quick heat transfer and stored heat.

Copper transfers heat up to 7x faster than cast iron for a faster healing 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 anti-condensing feature
Allows for direct replacement of traditionally piped cast iron boilers
Reduces installation time resulting in savings

Model	MBH	FT	Pump
JX050NPHU1	50	2001-5000	Yes
JX050NPIU1	50	5001-8000	Yes
JX050NPXU1	50	0-2000	Yes
JX050NXHU1	50	2001-5000	No
JX050NXIU1	50	5001-8000	No
JX050NXXU1	50	0-2000	No
JX075NPHU1	75	2001-5000	Yes
JX075NPIU1	75	5001-8000	Yes
JX075NPXU1	75	0-2000	Yes
JX075NXHU1	75	2001-5000	No
JX075NXIU1	75	5001-8000	No
JX075NXXU1	75	0-2000	No
JX100NPHU1	100	2001-5000	Yes
JX100NPIU1	100	5001-8000	Yes
JX100NPXU1	100	0-2000	Yes
JX100NXHU1	100	2001-5000	No
JX100NXIU1	100	5001-8000	No
JX100NXXU1	100	0-2000	No
JX125NLHU1	125	2001-5000	No
JX125NLIU1	125	5001-8000	No
JX125NLXU1	125	0-2000	No
JX150NLHU1	150	2001-5000	No
JX150NLIU1	150	5001-8000	No
JX150NLXU1	150	0-2000	No
JX200NLHU1	200	2001-5000	No
JX200NLIU1	200	5001-8000	No
JX200NLXU1	200	0-2000	No

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Brochure

Laars - Mini-Therm JX - Reliable Gas-Fired Residential Boiler