Installation & Operation Manual

8 Performance data

How to properly Size Your Indirect Water Heater

Use the First Hour Rating (FHR) to properly size your Indirect Water Heater. The First Hour Rating is the amount of hot water in gallons the heater can supply per hour (starting with a tank full of hot water), depending on tank capacity, source of heat, and the size of the burner.

Estimate your peak hour demand as follows:

Determine what time of day (morning, noon, evening) you use the most hot water in your home. Keep in mind the number of people living in your home.

Use the worksheet below to estimate your maximum usage of hot water during this one hour of the day -- this is your peak hour demand. Note: The worksheet does not estimate total daily hot water usage.

The worksheet example shows a total peak hour demand of 165 gallons; therefore, this household would need a water heater with a First Hour Rating of no less than 165 gallons.

Fixture Count Guide

To quickly estimate the minimum gallons of hot water required based on a family size number of baths and hot water appliances the First Hour Rating of the Squire must be equal to or exceed the total first hour requirements.

Peak Hour Demand Worksheet

 

Description

 

Fill in the Blank

Example

40

Gallons for the first 2 people

 

 

 

Gals.

40

Gals.

 

 

 

 

 

 

 

 

10

Gallons for each additional person

 

 

 

Gals.

20

Gals.

 

 

 

 

 

 

 

 

20

Gallons for each bath after the first

 

 

 

Gals.

20

Gals.

(consecutive bath)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

Gallons if dishwasher is used

 

 

 

Gals.

10

Gals.

 

 

 

 

 

 

 

 

20

Gallons if clothes washer is used

 

 

 

Gals.

20

Gals.

 

 

 

 

 

 

 

 

TOTAL

 

 

 

Gals.

110

Gals.

 

 

 

 

 

 

 

 

Heavy Usage Buffer

 

x 1.5

 

x 1.5

 

Use if family members take longer than average showers, etc.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

First Hour Rating

 

 

 

Gals.

165

Gals.

 

 

 

 

 

 

 

 

Proceed to pages 21 – 23 of this manual to locate your Indirect Water Heater and Boiler in the sizing charts. Using the First Hour Rating calculated in this worksheet, locate your Indirect Water Heater and Boiler along with your First Hour Rating. This will also determine the flow needed between the Indirect Water Heater and Boiler.

20

Page 20
Image 20
Lochinvar SIT119 How to properly Size Your Indirect Water Heater, Estimate your peak hour demand as follows, 110, 165

SIT030, SIT119 specifications

Lochinvar is a renowned manufacturer of high-efficiency heating solutions, including a range of commercial and residential boilers. Among their offerings are the Lochinvar SIT119 and SIT030 models, which exemplify the brand's commitment to innovation and efficiency in modern heating systems.

The Lochinvar SIT119 is designed for medium to large residential applications, boasting a powerful heating capacity. This model features a robust stainless steel heat exchanger that not only enhances durability but also promotes optimal heat transfer. As part of Lochinvar’s commitment to energy efficiency, the SIT119 incorporates advanced features such as a modulating burner system that adjusts the flame output based on the heating demand, resulting in lower energy consumption and reduced operational costs.

In addition to its efficiency, the SIT119 is equipped with user-friendly controls that allow homeowners and technicians to easily manage and monitor the system. Its intuitive digital display provides real-time information on system performance and diagnostic capabilities, facilitating maintenance and troubleshooting. Furthermore, the SIT119’s compact design enables versatile installation options, making it suitable for various residential spaces.

On the other hand, the Lochinvar SIT030 is tailored for smaller residential applications. Despite its smaller size, it doesn’t compromise on performance or efficiency. This model also features a high-quality stainless steel heat exchanger, ensuring longevity and consistent heating performance. Like the SIT119, the SIT030 utilizes a modulating burner system to optimize energy use, making it an environmentally friendly choice for homeowners seeking effective heating solutions.

One notable characteristic of the SIT030 is its low NOx emission design, which aligns with contemporary environmental standards and helps reduce the carbon footprint associated with heating. Additionally, both models support easy integration with existing heating systems and can be paired with renewable energy sources, such as solar thermal systems, maximizing their efficiency and sustainability.

In summary, the Lochinvar SIT119 and SIT030 models stand out in the heating market, combining advanced technologies with high efficiency and user-friendly features. Their stainless steel construction, modulating burners, compact design, and emissions compliance make them excellent choices for homeowners looking to invest in reliable and eco-conscious heating solutions. With these models, Lochinvar continues to lead in producing innovative products that meet the evolving demands of the heating industry.