US Boiler ALTA-120B Condensing Gas Boiler 120MBH Wall Hung NG/LP 95%

Name: US Boiler ALTA-120B Condensing Gas Boiler 120MBH Wall Hung NG/LP 95%
SKU: ALTA-120B-1G00
Price: 5153.30 USD
Availability: InStock

SKU: ALTA-120B-1G00

$5,153.30

Only 2 left in stock

Same-item volume pricing

Quantity	Unit price	Saving
1–4	$5,153.30	0%
5–9	$4,895.64	5%
10+	$4,637.97	10%

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Product Description

Overview

The U.S. Boiler ALTA-120B is a high-efficiency, stainless steel, modulating condensing boiler engineered for dependable hydronic heating performance. Designed for heating-only applications, the ALTA-120B delivers up to 120 MBH inputwith a wide 10:1 turndown ratio, ensuring quiet operation and maximum seasonal efficiency.

This unit features a durable stainless steel heat exchanger, sealed combustion design, and low-NOx operation. The ALTA control system provides automatic firing control, touch-screen diagnostics, and built-in self-monitoring for simplified installation and servicing.

The boiler ships as a complete packaged system, including a boiler loop circulator, condensate trap with cleanout, relief valve, and wall-mount kit. Designed for direct venting, it can be installed horizontally or vertically and easily converted from natural gas to LP without additional components.

Key Specifications:

120 MBH maximum input
95% AFUE efficiency
Stainless steel heat exchanger
1/2″ NPT gas connection
1″ NPT supply & return
2″ vent connection
Compact wall-hung design

Ideal for professional installers seeking reliability, efficiency, and long-term value.

Features

Genuine US Boiler high-efficiency condensing gas boiler
Model ALTA-120B
120 MBH heating capacity
Up to 95% AFUE energy efficiency
Wall-mounted design saves installation space
Compatible with Natural Gas (NG) and Liquid Propane (LP)
Stainless steel condensing heat exchanger
High-efficiency sealed combustion system
Quiet, dependable operation
Compact modern cabinet design
Electronic ignition for reliable startup
Factory-engineered for long service life
Suitable for residential and light commercial hydronic heating systems

Benefits

High-efficiency condensing technology helps reduce fuel consumption
Compact wall-hung design frees up mechanical room space
Compatible with both Natural Gas and LP fuel systems
Provides consistent, dependable home comfort
Durable construction designed for years of reliable service
Quiet operation with advanced combustion control
Excellent replacement for aging or inefficient boilers
Ideal for energy-conscious homeowners and HVAC professionals

Applications

Perfect for:

Residential homes
Hydronic heating systems
Radiant floor heating
Baseboard heating systems
Multi-zone heating applications
Light commercial buildings
Boiler replacement projects
New construction installations

Package Includes

(1) US Boiler ALTA-120B Condensing Gas Boiler
Factory-installed components
Items shown in the listing photos only

Important Compatibility Information

Please verify that the US Boiler ALTA-120B (Part No. ALTA-120B-1G00) is suitable for your heating application before purchasing. Installation should be performed by a qualified HVAC or plumbing professional and must comply with all local building codes, fuel gas regulations, and manufacturer installation guidelines.