100+ Free NABCEP SHI Practice Questions

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Question 1

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Which organization certifies solar thermal collectors for performance and safety in the United States?

OSHA

SRCC (Solar Rating & Certification Corporation)

EPA

NABCEP

to track

2026 Statistics

Key Facts: NABCEP SHI Exam

Exam Questions

NABCEP (60 scored + 10 pilot)

~70%

Passing Score

NABCEP (scaled)

4 hrs

Exam Duration

NABCEP

$500

Exam Fee

NABCEP ($125 app + $375 exam)

~55-65%

First-Time Pass Rate

Industry estimate

3 years

Certification Validity

NABCEP

The NABCEP SHI exam has 70 multiple-choice questions (60 scored + 10 pilot) in 4 hours with a scaled passing score. Major domains: Install the System (30%), Plan System Installation (19%), Commission the System (14%), Evaluate the Site (13%), Prepare for Project (12%), Service and Maintain (12%). Requires Solar Heating Associate or equivalent experience.

Sample NABCEP SHI Practice Questions

Try these sample questions to test your NABCEP SHI exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which organization certifies solar thermal collectors for performance and safety in the United States?

A.OSHA

B.SRCC (Solar Rating & Certification Corporation)

C.EPA

D.NABCEP

Explanation: The Solar Rating & Certification Corporation (SRCC) certifies solar thermal collectors under the OG-100 program for individual collectors and OG-300 for complete systems. NABCEP certifies installers, not equipment. Exam tip: Know the difference between OG-100 (collector rating) and OG-300 (system rating) — both are administered by SRCC/ICC.

2What does the SRCC OG-100 rating standard certify?

A.Heat exchanger efficiency

B.Solar thermal installer competency

C.Complete solar water heating systems

D.Individual solar thermal collectors

Explanation: SRCC OG-100 is the certification standard for individual solar thermal collectors, providing performance data including thermal efficiency, incident angle modifier, and thermal capacity. OG-300 covers complete solar water heating systems. Exam tip: OG-100 data sheets include clear-day energy output in BTU/day for various climate categories.

3Which plumbing code is most widely adopted in the United States for solar water heating installations?

A.International Plumbing Code (IPC)

B.NFPA 70

C.ASHRAE Standard 90.2

D.National Electrical Code (NEC)

Explanation: The International Plumbing Code (IPC), published by the International Code Council (ICC), is the most widely adopted plumbing code in the U.S. and contains provisions for solar thermal system installations. The NEC and NFPA 70 are the same document and cover electrical installations. Exam tip: Some jurisdictions use the Uniform Plumbing Code (UPC) instead of IPC — always verify local code adoption.

4What is the primary purpose of a temperature and pressure (T&P) relief valve on a solar storage tank?

A.To prevent the tank from exceeding safe temperature and pressure limits

B.To maintain a constant system pressure during normal operation

C.To regulate water flow to the collectors

D.To release air from the system during initial fill

Explanation: The T&P relief valve is a critical safety device that opens to discharge water if the tank temperature exceeds 210°F (99°C) or the pressure exceeds 150 psi (typically). This prevents catastrophic tank failure from overpressure or overtemperature conditions. Exam tip: T&P valves must have a discharge pipe that terminates within 6 inches of the floor or to an approved drain — never cap or plug the discharge.

5When working on a roof to install solar thermal collectors, what is the OSHA-required fall protection height threshold for general industry?

A.6 feet

B.8 feet

C.10 feet

D.4 feet

Explanation: OSHA requires fall protection for workers at heights of 6 feet or more above a lower level in the general industry and construction sectors (29 CFR 1926.501). This includes guardrails, safety nets, or personal fall arrest systems. Exam tip: Even below 6 feet, best practice dictates using fall protection on steep-slope roofs where the pitch exceeds 4:12.

6Which permit is typically required before installing a solar water heating system on an existing residential building?

A.Plumbing and/or mechanical permit

B.Zoning variance

C.Environmental impact permit

D.Electrical permit only

Explanation: Solar water heating installations typically require a plumbing and/or mechanical permit because they connect to the domestic hot water system. Some jurisdictions may also require a building permit for roof-mounted collectors. Exam tip: Always check local authority having jurisdiction (AHJ) requirements — some areas also require electrical permits if the system includes pumps or controllers on dedicated circuits.

7What is the minimum recommended slope for horizontal piping runs in a drainback solar thermal system?

A.1/2 inch per foot

B.1/4 inch per foot

C.1/8 inch per foot

D.1 inch per foot

Explanation: Drainback systems require a minimum slope of 1/4 inch per foot (approximately 2% grade) on all piping to ensure complete drainage of water from the collectors and piping when the pump shuts off. Insufficient slope can leave water trapped in the lines, leading to freeze damage. Exam tip: Avoid any horizontal traps or low spots — drainback systems rely entirely on gravity drainage for freeze protection.

8What is the primary advantage of evacuated tube collectors over flat plate collectors?

A.Higher efficiency in cold and cloudy conditions due to reduced heat loss

B.No need for freeze protection

C.Lower initial cost

D.Easier installation on all roof types

Explanation: Evacuated tube collectors use a vacuum between the inner absorber tube and the outer glass tube, which greatly reduces convective and conductive heat losses. This makes them significantly more efficient in cold, cloudy, or windy conditions compared to flat plate collectors. Exam tip: While evacuated tubes excel in cold climates, flat plate collectors may outperform them in hot climates where their lower cost and simplicity are advantages.

9In a closed-loop glycol solar thermal system, what is the typical concentration of propylene glycol in the heat transfer fluid?

A.10-20% by volume

B.70-80% by volume

C.30-50% by volume

D.100% (pure glycol)

Explanation: The typical propylene glycol concentration is 30-50% by volume, depending on the required freeze protection level for the installation location. A 50% solution provides freeze protection down to approximately -26°F (-32°C). Exam tip: Higher glycol concentrations increase viscosity and reduce heat transfer capacity, so use only the concentration needed for your climate — never use pure glycol as it has poor heat transfer properties.

10What is the solar fraction of a solar water heating system?

A.The percentage of total water heating energy provided by the solar system

B.The efficiency of the solar collector at peak conditions

C.The percentage of roof area covered by solar collectors

D.The ratio of the collector's aperture area to its gross area

Explanation: Solar fraction (SF) is the percentage of the total water heating load that is met by the solar energy system. A typical residential solar water heating system achieves a solar fraction of 50-80%, depending on climate, system size, and hot water usage patterns. Exam tip: A solar fraction of 100% is generally not cost-effective because the oversized system would stagnate during low-use periods.

About the NABCEP SHI Exam

The NABCEP Solar Heating Installer certification is the gold standard for professionals installing solar water heating, solar pool heating, and solar space heating systems. The exam covers six content areas based on the Job Task Analysis: project preparation, site evaluation, system planning, installation, commissioning, and service/maintenance. Certification demonstrates advanced competency in designing and installing solar thermal systems that comply with UPC, UMC, and USEC codes.

Assessment

70 multiple-choice (60 scored + 10 pilot)

Time Limit

4 hours

Passing Score

Scaled (~70%)

Exam Fee

$500 (application $125 + exam $375) (NABCEP / Meazure Learning)

NABCEP SHI Exam Content Outline

30%

Install the System

Collector mounting, piping, heat exchangers, pumps, controls, storage tanks, insulation, and structural attachments

19%

Plan System Installation

System design, component selection, sizing calculations, code compliance, and permit requirements

14%

Commission the System

Pressure testing, leak detection, system fill, charge, startup, performance verification, and documentation

13%

Evaluate the Site

Solar resource assessment, shading analysis, roof evaluation, structural capacity, and plumbing assessment

12%

Prepare for Project

Review plans and specifications, verify equipment, assess safety requirements, and coordinate with trades

12%

Service and Maintain the System

Troubleshooting, preventive maintenance, fluid replacement, performance monitoring, and warranty management

How to Pass the NABCEP SHI Exam

What You Need to Know

Passing score: Scaled (~70%)
Assessment: 70 multiple-choice (60 scored + 10 pilot)
Time limit: 4 hours
Exam fee: $500 (application $125 + exam $375)

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

NABCEP SHI Study Tips from Top Performers

1Master the six JTA content areas with emphasis on Install the System (30%) and Plan System Installation (19%)

2Know the differences between direct/indirect systems, drainback vs antifreeze, and active vs passive configurations

3Study freeze protection methods: drainback, propylene glycol antifreeze, and recirculation

4Understand collector types: flat plate, evacuated tube, and unglazed pool collectors and their applications

5Practice with SRCC OG-100 and OG-300 ratings and how they relate to system sizing and performance

Frequently Asked Questions

What is the NABCEP Solar Heating Installer exam?

The NABCEP SHI is the premier certification for solar heating installers in North America. It has 70 multiple-choice questions (60 scored + 10 pilot) in 4 hours covering installation, system planning, commissioning, site evaluation, project preparation, and maintenance of solar water heating, pool heating, and space heating systems.

What are the NABCEP SHI eligibility requirements?

You need either the NABCEP Solar Heating Associate credential or a qualifying combination of solar heating education/training and documented installation experience. Multiple pathways exist based on education level and field experience hours. Your application must be approved before scheduling the exam.

How hard is the NABCEP Solar Heating Installer exam?

The exam is challenging with an estimated 55-65% first-time pass rate. It requires strong knowledge of solar thermal systems, plumbing codes (UPC), mechanical codes (UMC), and hands-on installation experience. Most candidates study 80-120 hours over 8-12 weeks.

What types of solar heating systems does the exam cover?

The exam covers solar water heating (SWH), solar pool heating (SPH), and solar space heating systems. You need to know flat plate collectors, evacuated tube collectors, unglazed pool collectors, direct and indirect systems, drainback systems, and antifreeze systems.

How often must I renew NABCEP SHI certification?

NABCEP Solar Heating Installer certification must be renewed every 3 years. Renewal requires 18 continuing education hours (CEH) from NABCEP-approved providers plus a renewal fee.

What codes and standards should I study for the NABCEP SHI exam?

Key codes include the Uniform Plumbing Code (UPC), Uniform Mechanical Code (UMC), Uniform Solar Energy Code (USEC), and applicable sections of the NEC for electrical components. Also study SRCC standards for collector and system certification.

Is the NABCEP SHI exam open-book?

No, the NABCEP Solar Heating Installer exam is a closed-book exam. You cannot bring reference materials. You must know codes, system design principles, installation procedures, and commissioning steps from memory.