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What is the primary purpose of the NABCEP Solar Heating System Inspector (SHSI) certification?

To certify electricians who wire solar thermal controllers

To recognize individuals who have demonstrated the knowledge and skills necessary for inspecting solar heating systems

To license plumbers who connect solar storage tanks

To certify individuals who install solar thermal systems

to track

2026 Statistics

Key Facts: NABCEP SHSI Exam

Exam Questions

NABCEP (40 scored + 5 pilot)

Scaled

Passing Score

NABCEP (0-99 scale)

2 hrs

Exam Duration

NABCEP

$150

Exam Fee

NABCEP

None

Prerequisites

NABCEP

3 years

Certification Validity

NABCEP

The NABCEP SHSI exam has 45 multiple-choice questions (40 scored + 5 pilot) in 2 hours with a scaled passing score. Five knowledge areas: Mechanical and Solar Loop (25%), Appropriate System Design (20%), Structural (20%), Plumbing/Potable Piping (20%), Electrical (15%). No prerequisites required. Fee is $150. Certification valid for 3 years.

Sample NABCEP SHSI Practice Questions

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

1What is the primary purpose of the NABCEP Solar Heating System Inspector (SHSI) certification?

A.To certify electricians who wire solar thermal controllers

B.To recognize individuals who have demonstrated the knowledge and skills necessary for inspecting solar heating systems

C.To license plumbers who connect solar storage tanks

D.To certify individuals who install solar thermal systems

Explanation: The NABCEP SHSI certification recognizes individuals who have demonstrated the technical knowledge and skills necessary for inspecting solar heating systems for Authorities Having Jurisdiction (AHJs), utilities, incentive programs, investors, and others concerned with quality assurance. It is an inspection credential, not an installation or trade license. Exam tip: Understand the distinction between installer certifications and inspector certifications within the NABCEP framework.

2Which SRCC standard applies to the certification of individual solar thermal collectors?

A.SRCC OG-400

B.SRCC OG-200

C.SRCC OG-300

D.SRCC OG-100

Explanation: ICC 901/SRCC 100 (commonly called OG-100) is the standard for certifying individual solar thermal collectors. It requires testing in an accredited laboratory to assess the safety, durability, and thermal performance of each collector model. OG-300 covers complete solar water heating systems, not individual collectors. Exam tip: Remember OG-100 = collectors, OG-300 = complete systems.

3What does SRCC OG-300 certification cover?

A.Solar thermal controller electronics

B.Structural mounting hardware for solar collectors

C.Complete solar water heating systems including collectors, tanks, pumps, and piping

D.Individual solar thermal collectors only

Explanation: ICC 900/SRCC 300 (OG-300) certifies complete solar thermal systems, also known as solar water heaters. The system is modeled using information on each component, including collectors, tanks, pumps, heat exchangers, controllers, piping, and valves. This holistic certification ensures the entire system meets performance and safety requirements. Exam tip: OG-300 system modeling considers all components working together, not just individual parts.

4Which type of solar thermal system uses a heat transfer fluid in a closed loop that is physically separated from the potable water supply?

A.Thermosiphon system

B.Indirect (closed-loop) system

C.Direct (open-loop) system

D.Batch (ICS) system

Explanation: An indirect or closed-loop solar thermal system circulates a heat transfer fluid (typically a propylene glycol/water mixture) through the collectors and a heat exchanger. The HTF never contacts the potable water supply, providing freeze protection and separation from drinking water. Direct systems circulate potable water through the collectors. Exam tip: Indirect systems are the most common in freeze-prone climates because the glycol mixture provides freeze protection.

5During a pre-inspection document review, which document should the inspector verify to confirm the solar thermal system was permitted?

A.The building permit and approved plan set from the Authority Having Jurisdiction (AHJ)

B.The homeowner's purchase receipt

C.The installer's business license

D.The manufacturer's product brochure

Explanation: The inspector must verify that the solar thermal installation has an approved building permit and plan set from the AHJ. This confirms the system was reviewed by the building department and that the installation should comply with adopted codes. Without a valid permit, the installation may be considered illegal regardless of workmanship quality. Exam tip: Always check for both the building permit and mechanical/plumbing permits as required by the jurisdiction.

6What is the primary difference between a drainback and a pressurized glycol solar thermal system?

A.Pressurized glycol systems do not require a heat exchanger

B.Pressurized glycol systems use water as the heat transfer fluid

C.Drainback systems rely on gravity to drain fluid from collectors when the pump stops, while pressurized glycol systems remain filled and pressurized at all times

D.Drainback systems cannot be used for domestic hot water

Explanation: Drainback systems use gravity to drain the heat transfer fluid from the collectors back into a drainback tank when the circulation pump shuts off, preventing both freezing and overheating. Pressurized glycol systems remain filled and pressurized continuously, relying on the antifreeze properties of the glycol mixture for freeze protection. Exam tip: When inspecting drainback systems, verify proper pitch on all piping so fluid drains completely — trapped fluid can freeze and damage piping.

7An inspector is evaluating a solar thermal system designed for a swimming pool application. Which collector type is most commonly used for pool heating?

A.Unglazed polymer collectors

B.Flat plate collectors with selective coatings

C.Evacuated tube collectors

D.Concentrating parabolic trough collectors

Explanation: Unglazed polymer (plastic or rubber) collectors are the most common choice for swimming pool heating because they are inexpensive, lightweight, and efficient at the low temperature differentials typical of pool heating (usually only 10-15°F above ambient). Glazed flat plate and evacuated tube collectors are unnecessarily expensive for pool applications. Exam tip: Unglazed collectors lack a glass cover and insulation, making them suitable only for low-temperature applications like pools.

8What is the function of a differential temperature controller in a solar thermal system?

A.To activate the circulation pump when the collector temperature exceeds the storage temperature by a set differential

B.To monitor and display the system pressure

C.To regulate the temperature of the storage tank by mixing hot and cold water

D.To control the electrical resistance backup heating element

Explanation: A differential temperature controller compares the temperature at the collector outlet with the temperature at the bottom of the storage tank. When the collector is sufficiently hotter than storage (typically 8-16°F), it activates the circulation pump. When the differential drops below a lower set point (typically 3-5°F), it turns the pump off. This ensures the system only operates when useful heat can be collected. Exam tip: Verify that sensor placement matches manufacturer specifications — incorrect placement leads to short cycling or unnecessary pump operation.

9Which type of solar thermal collector achieves the highest operating temperatures and is best suited for high-temperature applications such as absorption cooling?

A.Unglazed flat plate collectors

B.Evacuated tube collectors

C.Single-glazed flat plate collectors

D.Batch (ICS) collectors

Explanation: Evacuated tube collectors achieve the highest operating temperatures among common solar thermal collector types due to the vacuum insulation that minimizes convective and conductive heat losses. They can efficiently produce fluid temperatures above 200°F, making them suitable for high-temperature applications including absorption cooling and process heat. Flat plate collectors are limited to lower temperatures. Exam tip: Higher operating temperatures also mean greater stagnation risk — inspectors should verify that overheat protection is adequate on evacuated tube systems.

10When reviewing plans before a site inspection, what should the inspector verify regarding collector orientation?

A.That collectors are mounted flat on the roof regardless of roof pitch

B.That collectors face west to capture afternoon sun only

C.That all collectors face exactly due south with no tolerance

D.That the azimuth and tilt angles match the approved design plans and are appropriate for the system application and latitude

Explanation: The inspector should verify that the installed collector azimuth (compass direction) and tilt angle match what was specified in the approved design plans and are appropriate for the site latitude and intended application. While due south is ideal in the Northern Hemisphere, deviations up to 30° east or west result in minimal performance loss. Tilt angle should be optimized for the application (latitude minus 15° for summer-dominant loads like pools, latitude for year-round DHW). Exam tip: Document any deviation from the approved plans and assess whether it materially affects system performance.

About the NABCEP SHSI Exam

The NABCEP Solar Heating System Inspector certification validates competency in inspecting solar heating systems for Authorities Having Jurisdiction (AHJs), utilities, incentive programs, and investors. The exam covers five knowledge areas: appropriate system design, structural inspection, mechanical and solar loop inspection, plumbing and potable piping inspection, and electrical inspection. No specific prerequisites are required, making it accessible to building inspectors and code officials.

Assessment

45 multiple-choice (40 scored + 5 pilot)

Time Limit

2 hours

Passing Score

Scaled score (0-99)

Exam Fee

$150 (NABCEP / Meazure Learning)

NABCEP SHSI Exam Content Outline

25%

Mechanical and Solar Loop

Collectors, piping, heat exchangers, pumps, expansion tanks, heat transfer fluid, freeze protection, and insulation

20%

Appropriate System Design for Applications

System types (SWH, SPH, space heating), collector selection, sizing, and design review for intended application

20%

Structural

Mounting systems, roof attachments, wind and snow loads, structural integrity, and weatherproofing

20%

Plumbing/Potable Piping

Potable water connections, backflow prevention, tempering valves, T&P relief valves, and UPC/IPC compliance

15%

Electrical

Controllers, sensors, wiring, disconnects, overcurrent protection, grounding, and NEC compliance

How to Pass the NABCEP SHSI Exam

What You Need to Know

Passing score: Scaled score (0-99)
Assessment: 45 multiple-choice (40 scored + 5 pilot)
Time limit: 2 hours
Exam fee: $150

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 SHSI Study Tips from Top Performers

1Focus on Mechanical and Solar Loop (25%) — know how to inspect collectors, piping, heat exchangers, and freeze protection

2Study the UPC and UMC code sections applicable to solar heating, especially backflow prevention and T&P relief valves

3Understand the differences between direct and indirect systems and their specific inspection requirements

4Know structural inspection criteria: roof attachment methods, flashing, waterproofing, and load considerations

5Review NEC requirements for solar heating electrical components: controllers, sensors, disconnects, and grounding

Frequently Asked Questions

What is the NABCEP Solar Heating System Inspector exam?

The NABCEP SHSI certification validates competency in inspecting solar heating systems. It has 45 multiple-choice questions (40 scored + 5 pilot) in 2 hours covering five areas: system design, structural, mechanical/solar loop, plumbing, and electrical inspection. It is designed for AHJ inspectors, code officials, and quality assurance professionals.

Are there prerequisites for the NABCEP SHSI exam?

No, there are no specific prerequisites for the NABCEP Solar Heating System Inspector exam. Anyone can apply and take the exam. However, knowledge of solar heating systems and applicable codes and ordinances is presumed. The exam is intended for individuals performing system inspections.

How is the NABCEP SHSI exam administered?

The SHSI exam is administered exclusively via Live Online Proctoring (LOP) through Meazure Learning. You take the exam from your own computer with a webcam and stable internet connection. No in-person testing centers are used for System Inspector exams.

What is the passing score for the NABCEP SHSI exam?

The SHSI uses a scaled passing score determined by psychometric analysis. Scores are reported on a 0-99 scale. The passing score is set by a criterion-referenced standard-setting exercise, not a curve. Any candidate who achieves the passing score earns the certification.

How often must I renew NABCEP SHSI certification?

NABCEP SHSI certification is valid for 3 years. Renewal requires 8 continuing education hours and a $150 renewal fee. As an alternative to CE hours, inspectors may retake the current SHSI exam to renew.

What is the difference between NABCEP SHSI and NABCEP PVSI?

SHSI is for inspecting solar heating systems (solar water heating, pool heating, space heating), while PVSI is for inspecting photovoltaic (electricity-generating) solar systems. SHSI focuses on plumbing, mechanical, and thermal systems; PVSI focuses on electrical systems and NEC Article 690.