43ADG-S3728_SoW_LVRC Kitchen Water Heater Replacement_REV 3-27-2026.pdf

Nevada Army National Guard Office of Installations and Environment Scope of Work Summary

Date: March 27, 2026 Project: Kitchen Water Heater Replacement at Las Vegas Readiness Center

General Intention: This Scope of Work is intended to include all work required to complete the project described below. Vendors who submit proposals are required to include and disclose in their proposal all work deemed necessary to complete the project.

Task(s): Furnish all equipment, materials, labor, engineering, supervision, commissioning, and permits necessary to remove an existing natural gas hot water heater and replace with a new tankless system for the Las Vegas Readiness Center kitchen area. The existing natural gas unit shall be replaced with a Rinnai CX199IN tankless water heater system.

Scope of Work: This project involves the replacement and modernization of the kitchen’s domestic hot water system. The existing gas-fired storage water heater is at the end of its service life and will be replaced with a high-efficiency, condensing instantaneous (tankless) water heating system. Work includes furnishing, installing, and commissioning a complete and operational system, including related gas piping, and ventilation. All work shall conform to applicable building codes and regulations as adopted by the State of Nevada, local ordinance, and manufacturer. The bid proposal should include, but is not limited to, the following tasks and details:

• Demolition and Removal o Disconnect and remove the existing 100-gallon gas-fired storage water heater (State model

SUF100199NE).

o Remove all associated piping, fittings, vents, and components as necessary.

o All materials and equipment to be removed by the Contractor and not reinstalled or recycled under this contract, including debris generated by this project, shall be legally disposed of off-site by the Contractor in accordance with all applicable environmental regulations.

• Instantaneous Water Heating System o Furnish and install a new tankless water heater rack system consisting of two (2) high-efficiency, fully condensing Rinnai CX199IN tankless water heater units.

o Units shall be properly sized and configured for simultaneous operation and connected to the existing hot water recirculation system.

o Furnish and install a water treatment system, such as the specified Scalecutter filter system or an equivalent that meets the manufacturer's water quality requirements for warranty compliance.

• Gas Line and Regulator Modifications o Furnish and install a new dedicated 3/4” medium-pressure gas line from the building’s gas meter to the kitchen water heater room.

o The total developed length of existing pipe from the meter to regulator is estimated to be 250- 500 feet, accounting for elevation and fittings. It is the contractor’s responsibility to verify all pipe lengths.

New medium-pressure gas line can be run on the interior or exterior of the building.

o Piping shall be sized in accordance with 2024 UPC and to meet the BTU demand of the new units.

o Install a new step-down regulator to drop gas pressure from the distribution pressure to the appliance's required inlet pressure (e.g., 5 psi to 7” WC).

o The contractor must verify that the existing gas meter and primary regulator have adequate capacity for the new load. Any required upgrades must be included in the bid.

It is the vendor’s responsibility to verify existing gas regulators are properly sized to meet CFH capacity and BTU delivery based on code and new system requirements.

Existing gas regulator (5,700 CFH capacity).

• Flue and Ventilation o The contractor shall verify that the existing 3" venting material and configuration are compliant with the new condensing water heater manufacturer's specifications. High-efficiency condensing appliances often require specific materials (e.g., PVC, CPVC, or stainless steel) due to the corrosive nature of the condensate. The existing venting may not be appropriate.

o The contractor shall manifold the flue piping from both water heaters as per the manufacturer's instructions and in line with 2024 UPC.

o Any modifications or penetrations to the roof must be coordinated with the NVARNG Project Manager to ensure the roof warranty is maintained.

o These tasks may be subcontracted but must be included in the contractor’s bid for a complete, finished system.

• Paint, Patch, and Sealing o Professionally seal all roof and wall penetrations to maintain weather and air barriers.

o Patch and paint any affected interior drywall surfaces to match existing finishes.

• Performance Requirements o Condensing Design: Unit shall be a fully condensing type with stainless steel or equivalent corrosion-resistant heat exchangers to maximize thermal efficiency and service life.

o Commercial Grade: Designed and certified for continuous operation in a commercial facility.

o Thermal Efficiency: Minimum 96% thermal efficiency per AHRI 1010 standard.

o Capacity: Minimum 13.5 GPM at the specified temperature rise (system total).

o Redundancy: Multiple independent heating modules allowing continued operation in the event of a module failure.

o Monitoring & Controls: Remote monitoring capability with BACnet/IP or Modbus integration for building management system connectivity.

o Warranty: Minimum 6-year heat exchanger warranty, 5-year parts warranty, and 1-year labor warranty.

o Certifications: UL 199 / CSA 4.3 listed and compliant with ASME Section IV for pressure vessels.

o Low-Emissions: Low-NOx compliance per SCAQMD Rule 1146.2 or equivalent.

o Serviceability: Unit design must allow replacement of internal components without removing the entire system from its installed location.

Deliverables:

• Submittals o Manufacturer’s technical data sheets for all major equipment and accessories.

o Preliminary Design / Engineering Submittal (For Review and Approval Prior to Construction)

Proposed system layout drawings (plan and schematic) showing equipment, piping, venting, and connections

Tankless water heater sizing calculations (BTU input/capacity) Hot water demand and flow calculations supporting 13.5 GPM requirement Gas piping sizing calculations (developed length, pressure drop, connected load) Water piping sizing and pressure/flow verification Venting design (materials, routing, equivalent length, terminations, and clearances) Combustion air calculations and code compliance approach Identification of any required electrical or structural modifications o All submittals shall be reviewed and approved by NVARNG Project Manager prior to procurement and installation.

• Photo Documentation o The contractor shall provide photographs documenting key stages of the project, including pre-construction conditions, in-progress work (especially piping and venting before concealment), and final installation.

• Testing, Startup, and Commissioning Documentation o Functional testing documentation verifying hot water flow meets or exceeds 13.5 GPM at the specified temperature rise.

o Combustion analysis and BTU delivery confirmation.

o Verification of proper gas pressure at unit(s) under full load.

o Final commissioning report confirming GPM and BTU performance.

o Proof of passing inspections for plumbing, gas, and mechanical work.

• Engineer-Stamped As-Built Drawings and Calculations (EOR Requirement) o Contractor shall provide final as-built drawings showing the completed installation, including:

Final installed locations of equipment, piping, venting, valves, and penetrations Gas and water piping schematics indicating sizing, routing, and tie-in points Venting diagrams showing roof/wall penetrations and termination details o A licensed Professional Engineer (PE) shall review, verify, and stamp the final as-builts and supporting calculations, including (minimum):

Hot water demand/flow calculations supporting 13.5 GPM performance requirement Temperature rise assumptions and sizing basis Tankless water heater unit sizing (BTU input/capacity) Gas piping sizing (developed length, pressure drop, demand load) Water piping sizing and flow/pressure verification Venting sizing and design (materials, equivalent length, terminations, clearances) Combustion air requirements and compliance o As-builts shall be provided in both hard copy and electronic format (PDF and a non-proprietary CAD format).

• Operation & Maintenance (O&M) Manuals o One (1) bound hard copy and one (1) electronic PDF copy.

o Manuals shall include manufacturer instructions, maintenance schedules, troubleshooting guides, and parts lists.

• Warranty Documents o Written warranty certificates for all equipment and materials.

o Warranty start date shall be the date of Owner’s final acceptance.

o Minimum warranty terms: 6-year heat exchanger, 5-year parts, 1-year labor.

• Closeout Package o Contractor shall submit one (1) complete closeout package including, at minimum:

Approved submittals Testing/startup/commissioning documentation O&M manuals Warranty documents Engineer-stamped as-built drawings and calculations Proof of passing all required inspections (plumbing, gas, and mechanical) Project photos

The following codes should be reviewed and considered when preparing the bid proposal:

• State of Nevada adopted building, plumbing, mechanical, electrical, and energy codes, as applicable.

• Clark County Building Department amendments and local ordinances.

• Local city/county codes and permitting requirements.

• Manufacturer installation requirements for warranty compliance.

• Applicable NFPA standards, including NFPA 54 (National Fuel Gas Code) and NFPA 70 (National Electrical

Code).

• OSHA safety regulations and job site safety protocols.

• In case of conflict between codes, standards, and manufacturer's instructions, the most stringent requirements shall apply.

Should you need additional project information before submitting your proposal, please do not hesitate to reach out to one of the POC’s listed below.

Location:

Las Vegas Readiness Center (LVRC) 4500 West Silverado Ranch Road Las Vegas, NV 89139

Schedule:

TBD by NVARNG Project Manager.

Payment Schedule:

• 75% – Upon completion of construction (installation complete and system operational)

• 25% – Upon delivery and acceptance of complete closeout package (incl. commissioning report + engineer-stamped as-builts)

Point(s) of Contact:

Contract Support/Questions – Devin Earl (775) 887-7280 Project Manager(s) – Paul Toups (775) 634-5089 Isaac Fuentes (775) 781-7880

End of Summary

Note: The following documents are required prior to contract approval: State of Nevada Business License, vendor must provide at a minimum, proof of liability and worker’s compensation insurance (the insurance certificate must name the Office of the Military 2460 Fairview Drive Carson City, NV 89701 as defined in NRS 41.0307 as the certificate holder and additionally insured), vendor must be a registered vendor with State of Nevada Controllers Office, and vendor must use electronic transfer for payment.