Endurance

Product catalog summary

Overview: The Laars Endurance is a gas-fired, sealed combustion combination boiler and water heater designed for efficient space heating and continuous domestic hot water supply. It combines the functions of two separate appliances into one compact unit, offering space, energy, and cost savings.

Specifications: The boiler operates at over 85% efficiency (AFUE) and supports both natural and propane gas. It features low NOx emissions (<25 ppm) and automatic burner modulation from 57% to full fire. The unit is designed for direct venting with sealed combustion and can be installed with minimal clearances.

Design and Construction: The Endurance is built with a sealed stainless steel combustion chamber and a copper-finned cylindrical tube heat exchanger. It is certified to ANSI standard Z21.13 and constructed according to ASME Boiler & Pressure Vessel Code. The maximum working pressure is 30 psi, with a hydrostatic test pressure of 60 psi.

Features: Key features include outdoor reset for efficiency, a built-in circulating pump, anti-condensing controls, and a pump exerciser. The unit has a 20-gallon buffer tank for immediate hot water delivery and a brazed plate heat exchanger for continuous hot water supply.

Control and Safety: The boiler includes an easy-to-use control interface with a 3-character alphanumeric display for temperatures and fault codes. It has built-in safety limits and displays fault codes for various sensors and internal controls. LEDs indicate pump status, ignition attempts, and gas valve activity.

Installation and Venting: The Endurance can be installed almost anywhere due to its compact design, internal bypass, built-in pump, and flexible venting options. It supports both horizontal and vertical venting, with direct vent lengths up to 15 feet.

Environmental and Economic Benefits: The boiler's high efficiency and low emissions make it an environmentally friendly choice. The outdoor reset feature helps save on fuel bills by adjusting heat output based on outdoor conditions, ensuring consistent indoor temperatures.

Warranty: The Laars Endurance comes with a 20-year limited warranty, ensuring long-term reliability and performance.

Catalog excerpts

ENDURANCE Gas Fired Hydronic Combination Boiler and Water Heater

Open the catalog to page 1

The Laars Endurance is a gas-fired, sealed combustion, combination boiler and water heater that offers uniform space heating as well as quick delivery of an endless supply of domestic hot water, all in one compact, efficient package. One Endurance can do the work that traditionally has been done by two separate heating appliances, saving homeowners space, energy and money! ENVIRONMENTALLY FRIENDLY features are at the heart of the Endurance, making it both an economical and environmentally conscientious choice. Features include 85%+ efficiency, low NOx emissions (less than 25 ppm) and advanced...

Open the catalog to page 2

ENDLESS DOMESTIC HOT WATER The ingenious Endurance design delivers space heating and an endless supply of domestic hot water in one small package! You turn on your shower (faucet, washing machine...) and hot water immediately flows from the Endurance 20-gallon “hot buffer tank” through a flat plate heat exchanger. The flat plate heat exchanger efficiently and quickly passes heat to the domestic water and out to your shower. At the same time the boiler turns on, heats up fast and keeps hot water flowing through the flat plate heat exchanger and to your shower for as long as you need it. The buffer...

Open the catalog to page 3

Heating Systems Company 800.900.9276 • Fax 800.559.1583 (Customer Service, Service Advisors) 20 Industrial Way, Rochester, NH 03867 • 603.335.6300 • Fax 603.335.3355 (Applications Engineering) 1869 Sismet Road, Mississauga, Ontario, Canada L4W 1W8 • 905.238.0100 • Fax 905.366.0130 Litho in U.S.A. © Laars" Heating Systems Co. 1409 Document 1191E

Open the catalog to page 4

Endurance

Endurance

Catalog excerpts

All Laars catalogs and technical brochures