Enerco TSVFR30LPT Manuel D’Utilisation

Installation Instructions and Owner’s Manual

Unvented LP-Gas Vent Free Room Heaters

*Adjoining rooms are communication only if there 

are doorless passageways or ventilation grills be-

tween them.

Use this method to determine if you have a confined or 

unconfined space.

Note: the space includes the room in which you 

install heater plus any adjoining rooms with doorless 

passageways or ventilation grills between the rooms.

1. Find the volume of the space by multiplying room 

length x width x height.

Example: Space size 18ft (length) x 18ft. (width) x 8ft.  

 

(height) = 2592

If additional ventilation to adjoining room is supplied 

with grills or openings, add the volume of these rooms 

to the total volume of the space.
2. Divide the space volume by 50 cubic feet to deter-

mine the maximum Btu/hr the space can support.

Example: 2592 cu.ft. (volume of space) / 50 cu.ft. =  

 

51.8 or 51,800 (maximum Btu/hr the space  

 

can support)

WARNING: If the area in which the heater may be 

operated is smaller than defined as an unconfined 

space or if the building is of unusually tight con-

struction, provide adequate combustion and ventila-

tion air by the methods described in the National 

Fuel Gas Code, NFPA 54/ ANSI Z223.1, Section 

5.3 or applicable local codes. 

3. Add the Btu/hr of all the fuel-burning appliances 

in the space such as, Vent–free heater, Gas water 

heater, Gas furnace, Vented gas heater, Gas fire-

place logs, and Other gas appliances*

*Do not include direct-vent gas appliances. Direct-

vent draws combustion air from the outdoors and 

vents to the outdoors.
Example:  Gas water heater 

40,000 Btu/hr

 

 

Vent Free Heater + 

20,000 Btu/hr

 

 

Total   

 

=60,000 Btu/hr

4. Compare the maximum Btu/hr the space can support 

with the actual amount of Btu/hr used.

Example:   51,800 Btu/hr (maximum Btu/hr the  

 

 

space can support)

 

 

60,000 Btu/hr (Actual amount of Btu/hr  

 

 

used)

The space in the above example is a confined 

space because the actual Btu/hr used is more than 

the maximum Btu/hr the space can support.

are as follows:
A. Rework worksheet, and the space of an adjoining 

room. If the extra space provides an unconfined 

space, remove door to adjoining room or add venti-

lation grills between the rooms. See Ventilation Air 

From Inside Building (Figure 2).

B. Vent room directly to the outdoors. See Ventilation 

Air From Outdoors (Figure 3). 

C. Install a lower Btu/hr heater if lower Btu/hr size 

makes room unconfined. 

If actual Btu/hr used is less than the maximum Btu/

hr the space can support, the space is an uncon-

fined space. You will need no additional fresh air 

ventilation.

This fresh air would come from an adjoining unconfined 

space. When ventilation to an adjoining unconfined 

space, you must provide two permanent openings: one 

within 12” of the ceiling and one within 12” of the floor 

on the wall connecting the two spaces (see options 1 

& 2 of fig. 2). You can also remove door into adjoin-

ing room (see option3, fig 2). Follow the National Fuel 

Gas Code NFPA 54/ ANSI Z223.1, Section 5.3, Air for 

Combustion and Ventilation for required size of ventila-

tion grills or ducts.

INLET 

AIR

OUTLET 

AIR

VENTILATION CRAWL SPACE

TO CRAWL 

SPACE

TO ATTIC

VENTILATION AIR

VENTILATED 

ATTIC

OUTLET AIR