How to Estimate the Heater Size for a Garage

A basic rule of thumb for forced-air heaters is 45,000 Btu to heat a two- to 2-1/2 car garage, and a 60,000 Btu garage heater for a three-car garage. The makers of low-intensity infrared tube heaters say that 30,000 Btu can heat a two to 2-1/2 car garage, and suggest 50,000 for a three-car garage.

1. Measure the length and width of your garage.
2. Check your garage’s insulation.
3. Divide your total square footage by 200, and then multiply your answer by 9,000 to determine the BTU requirements for an uninsulated garage.
4. Find a heater with a BTU output that matches your results.

80 X 1,000 square feet = 80,000 BTUs.

Size and Ceiling Height

To determine the number of BTUs per square foot that you need to heat a room, simply multiply the square footage by 20 BTUs per square foot. For example, if a room has 1,000 square feet, you would require 20,000 BTUs to heat it.

Chart of Recommended Heating BTU Per Square Foot

To heat a 2,000 square foot home, you will need approximately 40,000 BTU’s of heating power.

How Is Your Room’s BTU Requirement Calculated? A room’s BTU requirement is based upon the cubic volume of the space – the height, length and the width of the room multiplied by four (done for you by our calculator) – and what is above, below and besides the room.

To obtain the cubic feet per hour of gas required, divide the input of the appliances by the average Btu (kW. h) heating value per cubic foot of the gas. The average Btu per cubic foot in the Bay Area is 1,100.

Total piping length = 84 feet (use Table 3 @90 feet) From a to b, demand = 38,000 + 35,000 + 30,000 = 103,000 BTU/hr; use 3/4″ pipe From b to c, demand = 38,000 + 35,000 = 73,000 BTU/hr; use 1/2″ pipe or 3/4″ tubing From c to d, demand = 35,000 BTU/hr; use 1/2″ pipe or 5/8″ tubing From c to e, demand = 38,000 BTU/hr; …

GAS PIPE SIZING You can flow only so much gas (or water) through a given pipe size, so restrictions will manifest themselves as a lack of pressure or volume. Sizing a gas line is not too difficult. It is easier to start at the last appliance and work your way back to the as meter and/or regulator.

Some homes are only equipped with gas lines that are 3/4 inch (“) in diameter, as this is a standard size for supporting major appliances. Other homes may have a combination of 1-inch, 1/2-inch, and 3/4-inch gas lines.

The capacity of the meter and regulator must be greater than the total sum of the maximum BTU rating of all the appliances in the home. If the capacity of the system is too small, the gas appliances will not receive the volume of gas required for proper operation.

1/2-in.

Generally, 1-in supply pipe is adequate for furnace inputs up to 125,000 Btu/h. A 11⁄4-in pipe is recommended for higher inputs. The inlet gas supply pipe size should never be smaller than 1⁄2 in. The gas line from the supply should serve only a single unit.

(1) Measure the length of the pipe from the gas meter location to the most remote outlet on the system. (2) Locate that total length in the left-hand column of sizing table*, or the next longer distance where the table does not give the exact length.

Size & Demand A gas meter rated at a maximum continuous capacity of 250 cf/h is capable of providing 250,000 Btu/h maximum. If the continuous meter capacity is greater than demand, your gas meter’s size is acceptable.

How to Run the Lines from the Propane Tank into Your Home

1. Step 1: Find the Right Pipes.
2. Step 2: Prepare the Rest of the Necessary Tools.
3. Step 3: Connect the Pipes to Propane Tank.
4. Step 4: Drill a Hole in Your Wall.
5. Step 5: Pass the Pipe through the Opening.
6. Step 6: Connect the Pipe to the Appliance.

Installing a gas line is probably not a task to take on as your first do-it-yourself project. However, experienced do-it-yourselfers can install a gas line as safely as a professional. Despite the narrow margin for error, the individual steps are no more demanding than plumbing or electrical work.

10 feet

Question-”Is a 20 lb propane tank high or low pressure?” It is ‘low pressure’ but the pressure is dependent on temperature. A higher pressure will cause the pressure relief valve to actuate. Propane is pressurised to work in cold and hot climates.

They are essentially interchangeable from a use point of view. The problems come if the ambient temperature drops below -0.4°C. That is the boiling point for butane.