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Key Facts: NV C-1H Water Heater Exam

20 Q

Official Exam Questions

PSI Nevada Contractor CIB updated 3/25/2026

70%

Passing Score

PSI Nevada Contractor CIB updated 3/25/2026

45 minutes

Time Allowed

PSI Nevada Contractor CIB updated 3/25/2026

USD 95

PSI Exam Fee (one portion)

PSI Nevada Contractor CIB updated 3/25/2026

Open Book

Book Policy

PSI Nevada Contractor CIB updated 3/25/2026

Nevada C-1H Water Heater Contractor Examination is the official NSCB/PSI open book exam: 20 questions, 70% (14 of 20 points), 45 minutes, USD 95 (bulletin 270, updated 3/25/2026). Official delivery: English.

Sample NV C-1H Water Heater Practice Questions

Try these sample questions to review concepts for the NV C-1H Water Heater exam. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Under the 2018 UPC, a storage water heater heating potable water must be protected by which listed relief device?
A.A vacuum breaker only, installed on the hot outlet
B.An approved, listed combination temperature-and-pressure relief valve
C.A boiler pop-off valve set at 30 psi
D.A pressure-reducing valve on the cold-water inlet
Explanation: 2018 UPC Section 608.3 requires a storage water heater to have an approved, listed, adequately sized combination temperature-and-pressure (T&P) relief valve. The valve is the last line of protection after the thermostat and high-limit control. Instantaneous heaters with an inside diameter of not more than 3 inches are the stated exception.
2The 2018 UPC exempts which appliance from the combination T&P relief-valve requirement that applies to storage water heaters?
A.Any tankless heater, regardless of size
B.An electric storage heater of 40 gallons or less
C.A listed nonstorage instantaneous heater with an inside diameter of not more than 3 inches
D.A gas storage heater with input of 40,000 Btu/h or less
Explanation: Section 608.3 exempts listed nonstorage instantaneous heaters that have an inside diameter of not more than 3 inches (80 mm), such as a small point-of-use unit. Typical residential tank-type heaters and larger instantaneous units still require a combination T&P valve. If the small heater is on a closed system, an expansion tank is still required.
3When selecting a combination T&P valve for a storage water heater, the 2018 UPC and the valve listing require the valve’s Btu capacity to do which of the following?
A.Equal one-half of the heater’s nameplate input
B.Equal or exceed the water heater’s Btu input rating
C.Match the first-hour rating printed on the Energy Guide label
D.Be no greater than 40,000 Btu/h for any residential tank
Explanation: The T&P valve must be able to relieve the full heat input of the appliance. An undersized valve cannot dump energy fast enough if both the thermostat and the high-limit fail. Where a valve plate shows two Btu ratings, use the smaller rating for the comparison.
4Manufacturers of combination T&P valves, as explained in the 2018 UPC Illustrated Training Manual commentary on Section 608.3, require the temperature-sensing element to be immersed where?
A.In the cold-water dip tube near the tank bottom
B.In a tee on the gas control
C.Within the top 6 inches of the tank, where the hottest water collects
D.In the expansion tank on the building side of the backflow preventer
Explanation: The hottest water stratifies at the top of a storage tank. The T&P temperature probe must sit in that zone—typically the top 6 inches—so the valve opens before the tank reaches a dangerous temperature. Installing the valve on a remote fitting that does not immerse the element is a listing violation.
5Under 2018 UPC Section 608.5, which device is prohibited on the discharge piping of a temperature or pressure relief valve?
A.A listed dielectric union on the cold inlet
B.A fullway shutoff on the cold-water supply
C.A draft-hood connector
D.A valve, obstruction, or other means of isolation
Explanation: Section 608.5 requires relief-valve discharge piping to have no valves, obstructions, or means of isolation. A closed or failed valve on that pipe would turn the tank into an unrelieved pressure vessel. The discharge must remain open, full size, and able to flow by gravity.
6The 2018 UPC requires the T&P relief-valve drain to be not smaller than which dimension?
A.One-half the tank diameter
B.The relief-valve outlet
C.The cold-water dip tube
D.The draft-hood collar
Explanation: Section 608.5 requires the discharge pipe to be equal to the size of the valve outlet and to remain full size to the point of discharge. Reducing the pipe, using coiled tubing that cuts the bore, or stepping down to 1/2 inch on a 3/4-inch valve restricts relief flow.
7Why does the 2018 UPC forbid a threaded terminal on a relief-valve discharge pipe?
A.Threads reduce the Btu rating printed on the valve
B.Threads are required only on gas piping
C.A threaded end could be capped, blocking the required open discharge
D.Threads prevent the pipe from being sloped to drain
Explanation: Section 608.5 states that the terminal end of the drain pipe shall not be threaded. The rule exists so nobody can screw on a cap or plug and silently disable the relief path. The open end must point down and remain obvious.
8A T&P discharge pipe that dips to form a water-filled loop violates the 2018 UPC because the drain must be which of the following?
A.Pumped to a receptor
B.Trapped like a fixture drain
C.Insulated to R-12.5
D.Installed so that no part is trapped or subject to freezing, and so that it drains by gravity
Explanation: Section 608.5 requires gravity drainage with no trap and no portion subject to freezing. A sag or loop holds water, can freeze, and can keep the valve from relieving. Route the pipe continuously downhill to an approved termination.
9Where a 2018 UPC relief-valve drain terminates outdoors above grade, the pipe end must point downward and be located how far above the ground or flood level of the receiving area?
A.Not more than 2 feet and not less than 6 inches
B.Not more than 6 inches and not less than 1 inch
C.Exactly 36 inches to keep discharge away from children
D.Flush with finished grade so the pipe is hidden
Explanation: The 2018 UPC discharge-piping rule sends the drain independently by gravity to the drainage system or outdoors, with the end not exceeding 2 feet (610 mm) and not less than 6 inches (152 mm) above the ground and pointing down. That window keeps the outlet visible, above splash and debris, and low enough to limit scald spray.
10Under the 2018 UPC, discharging a water-heater relief valve into the water-heater pan is which of the following?
A.Required so one drain serves both devices
B.Prohibited
C.Allowed if the pan drain is increased to 1-1/2 inches
D.Allowed only for electric heaters
Explanation: The 2018 UPC states that discharge from a relief valve into a water heater pan shall be prohibited. The pan is only a leak receptor. Combining the two can flood the pan, hide a relieving valve, and send scalding water where it is not intended. Run the T&P drain independently to an approved location.

About the NV C-1H Water Heater Exam

The Nevada C-1H Water Heater Contractor Examination is the official Nevada State Contractors Board trade or management examination administered by PSI Services LLC. The official exam has 20 scored questions. Passing is 70% (14 of 20 points) in 45 minutes. The examination is open book. Approved center references include Uniform Plumbing Code, 2018 (allowed in center). PSI lists USD 95 for one examination portion and USD 140 if taken with CMS; otherwise USD 95 per trade exam (Candidate Information Bulletin updated 3/25/2026). NSCB requires a separate CMS examination for most new applicants, plus a USD 300 application fee and a USD 600 biennial license fee. This English-language MCQ bank is a study aid, not an official PSI form. It does not replace required trade experience, board approval, fingerprints, bonding, or the official examination.

Exam sponsor: PSI Services LLC (for the Nevada State Contractors Board). The requirements and fees below concern the certification or admission exam, separate from our free practice resources.

Assessment

Open Book computer-based multiple-choice. Uniform Plumbing Code, 2018 (allowed in center)

Time Limit

45 minutes

Passing Score

70% (14 of 20 points)

Exam / Certification Fees

USD 95

Exam sponsor website

Fees, eligibility, and exam policies can change. Confirm them with the exam sponsor before applying or paying.

Our practice resources: topics covered

We aim to reflect publicly available exam outlines and topic information in our study resources. Coverage, format, and difficulty may differ from the actual exam, and we cannot guarantee that every detail is accurate or current. Confirm exam requirements, fees, and policies with the official exam sponsor.

80%

Code

UPC water-heater code (16 items)

20%

General Water Heater Knowledge

General water-heater knowledge (4 items)

Preparing for the NV C-1H Water Heater Exam

What You Need to Know

  • Passing score: 70% (14 of 20 points)
  • Assessment: Open Book computer-based multiple-choice. Uniform Plumbing Code, 2018 (allowed in center)
  • Time limit: 45 minutes
  • Exam / certification fees: USD 95 Official sources

Using Our Practice Resources

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

NV C-1H Water Heater: Suggested Study Strategy

1Distribute study time to the official bulletin 270 content outline (updated 3/25/2026)
2Use only the PSI-listed references; temporary tabs such as Post-it notes are prohibited
3Confirm NSCB experience documentation before scheduling with PSI
4This bank is an English-language MCQ study aid, not an official PSI form

Frequently Asked Questions

How many questions are on the Nevada C-1H Water Heater Contractor Examination?

The official PSI examination has 20 scored questions. Passing is 70% (14 of 20 points) within 45 minutes (Candidate Information Bulletin 270, updated 3/25/2026).

How much does the NV C-1H Water Heater exam cost?

PSI lists USD 95 for one examination portion. Two portions cost USD 140 only if the second portion is CMS. NSCB charges a separate USD 300 application fee and USD 600 biennial license fee.

Is the NV C-1H Water Heater exam open book?

Yes. PSI lists this examination as open book. Uniform Plumbing Code, 2018 (allowed in center)

Do I still need the CMS examination?

CMS is the required Nevada business-and-law examination. Most new applicants must pass CMS and a trade examination for the requested classification. In most cases you will not retake an exam if you have actively served as a qualified employee in the same classification within the last four years.