Navien NCB700-42C, Installation & Operation Manual

Installing the Boiler        19

3.1    Choosing an Installation Location

When choosing an installation location, you must ensure 

that the location provides adequate clearance for the boiler, 

adequate flue and drainage options, and sufficient access to gas, 

water, and electrical supplies.

Carefully consider the following factors when choosing an 

installation location:

Compliance Requirements

This boiler must be installed by qualified personnel in 

compliance with the applicable Laws and Regulations. 

In general, these Laws and Regulations are the Basic Gas 

Installation Standards, the Heating, Air Conditioning and 

Domestic Water Installation Regulation and all other local 

regulations.

Access to Utilities

●

Water–the installation location should be near where the 

domestic water supply enters the building.

●

Gas–the installation location should be near where the gas 

supply enters the building.

●

Electricity–the installation location should be near where the 

electrical supply enters the building.

Humidity and Contact with Water

When installing the boiler, avoid places with excessive humidity. 

The boiler has electric gas ignition components. Water spray or 

droppings can get inside the boiler and damage the ignition 

system. The boiler must be installed in a way to ensure that 

the gas ignition system components are protected from water 

(dripping, spraying, rain, etc.) during operation and service.

If the boiler is installed in a very humid room (a shower room 

or bathroom, for example), the Low Voltage regulation and 

the Technical Building Code must be observed for correct 

installation.

Proximity to Fixtures and Appliances

Install the boiler near fixtures that deliver or use hot water, 

such as bathroom, kitchen, and laundry room faucets. Select 

a location that minimises the water piping required between 

major fixtures. If the distances are long or if the user requires 

“instant“ hot water, installation of a recirculation line which 

circulates domestic hot water back to the boiler from the 

furthest fixture is recommended. Insulate as much of the hot 

water supply and recirculation lines as possible. For more 

information about the water supply, refer to "4.2 Installing a 

Domestic Hot Water (DHW) System” on page 23.

Adequate Drainage

The boiler produces a significant amount of condensate during 

operation. This condensate must be removed from the boiler, 

and suitably treated if national legislation so requires. The boiler 

should be located near a suitable drain and where damage from 

a possible leak will be minimal. Installing the boiler in a location 

without a drain will void the warranty and Navien will not be 

responsible for water damage that occur as a result. For more 

information about condensate drainage, refer to “4.3 Connecting 

the Condensate Drain Line” on page 23.

The boiler must be located in an area where leakage of the unit 

or connections will not result in damage to the area adjacent 

to the appliance or to lower floors of the structure. When such 

locations cannot be found, installation of an adequately drained 

drain pan under the boiler is highly recommended. When 

installing the drain pan, ensure that the installation does not 

restrict combustion air flow.

Adequate Flue and Ventilation

No specific ventilation is required in the room the boiler is 

installed in. If it is installed in a cupboard or compartment, no 

specific ventilation is required, providing the aforementioned 

dimensions are observed. The requirements and 

recommendations stipulated in the Regulation for Heating 

Installations in Buildings (RITE) and any other applicable 

legislation in this field must be observed.

Select a location that requires minimal flue. Consider flue 

restrictions caused by windows, doors, air intakes, gas meters, 

foliage, and other buildings. For more information about flue 

system, refer to “6. Flue System” on page 29.

To ensure adequate flue and ventilation, follow these guidelines:

●

Maintain proper clearances from any openings in the building.

●

Install the boiler with a minimum clearance of 300 mm above 

an exterior grade or as required by local codes.

●

Do not enclose the flue termination.

●

Install the exhaust flue in an area that is free from any 

obstructions, where the exhaust will not accumulate.

●

Do not install the boiler where moisture from the exhaust may 

discolour or damage walls.

●

Do not install the boiler in bathrooms, bedrooms, or any 

other occupied rooms that are normally kept closed or not 

adequately ventilated.

The requirements and recommendations stipulated in the 

Regulation for Heating Installations in Buildings (RITE) and any 

other applicable legislation in this field must be observed.

3.    Installing the Boiler