Antifreeze Calculation Guide for Villa Packages — Table + Practical Example

Guide to Calculating the Amount of Antifreeze for a Villa Package

Did you know that using the wrong amount of antifreeze — too little or too much — can both damage your villa's heating system? If it's too little, the system will freeze in the cold of winter; if it's too much, thermal efficiency will decrease and costs will increase. In this guide, you'll learn step-by-step how to estimate the total volume of water in the system, consider the minimum temperature in your area, and calculate the exact amount of antifreeze based on a standard table — without the need for an engineer or complicated tools.

Why is accurate antifreeze calculation important?

Many villa owners add only “one or two liters” of antifreeze to the system — without considering:

• The actual temperature of the area (for example, Saveh with a temperature of -35 degrees requires a higher concentration)
• The actual volume of water in the system (200-meter villa ≈ 80 liters of water; 500-meter villa ≈ 200 liters)
• The optimal mixture ratio (each temperature requires a specific ratio)

Result:

• Low antifreeze: freezing, bursting of pipes
• High antifreeze: increased viscosity, reduced flow, excessive load on the pump

Our goal: the lowest effective amount — not the highest, not the lowest.

Step 1: Estimate the volume of water in the villa’s heating system

The volume of water in the system can be calculated approximately from the area of ​​the villa and the number of radiators:

Practical tip:

• A standard radiator has a capacity of ≈ 7–10 liters
• Internal piping accounts for ≈ 30–40% of the total volume

If you want to be more precise:

1. Drain the system

2. Collect the drained water in 20 liter containers

3. Count the number of containers

Step 2: Determine the minimum temperature of the region

Before calculating, you need to know what the lowest temperature your region has experienced in winter is. You can get this data from:

• Iranian Meteorological Organization website
• Reports from the last 10 years of the region
• Local experience (for example, "In 1400, the temperature in our villa reached -28")

To be more certain, add 3 to 5 degrees Celsius to the lowest historical record.

Example:

• Region: Saveh → Lowest temperature: -32 → Protection target: -35 degrees
• Region: Karaj → Lowest temperature: -18 → Protection target: -23 degrees

Step 3: Using the standard consumption table

With the target temperature and the volume of water in the system, use the table below:

Calculation example:

• Your villa in Saveh (target: -35)
• System volume: 120 liters
• Required ratio: 1:1 (according to the table for -34 to -23)
• Amount of antifreeze = 120 ÷ 2 = 60 liters

Technical note: The ratio of 1:1 means 50% antifreeze + 50% water, not using pure antifreeze.

Step 4: How to properly inject antifreeze

1. Completely empty the system

2. If necessary, perform chemical flushing

3. Mix the antifreeze with clean water (according to the ratio in the table)

4. Enter the mixture into the system through the filling valve or injection pump

5. Adjust the system pressure to 1.5 bar

6. Run the system for a few hours to allow the mixture to spread evenly

Warning:

Never inject pure (undiluted) antifreeze — there is a risk of damage to metals and reduced efficiency

Use antifreeze that is also anti-corrosion, anti-foam and anti-scale

Frequently asked questions by villa owners

Can I fill antifreeze directly into the system without draining it?

Only if:

• The system already contained antifreeze
• The old antifreeze is still intact (pH > 8.5, clear color)

Otherwise, draining and flushing are necessary — as the mixture of old and new antifreeze may cause an adverse reaction.

Can I use car antifreeze?

No. Car antifreeze:

• Designed for aluminum and steel
• May damage copper (in villa pipes)
• No anti-foam and anti-scale

How do I know if the antifreeze is suitable for the temperature in my area?

You can measure the actual freezing point of the mixture with a refractometer (affordable, available online). If the freezing point is lower than your target, that's fine.

Conclusion: Correct Calculation = Smart Protection

Accurate antifreeze calculation is not a complicated technical task, but a smart decision that prevents:

• Freezing pipes
• Package burst
• Emergency repair costs

With two simple data points — system volume and area temperature — you can calculate the exact amount of antifreeze in 10 minutes.

If you are still not sure of the right amount, take a water sample from the system right now and perform a simple pH or freezing test. This small task can prevent thousands of dollars in costs.

If you need expert advice to identify the type of sediment or the optimal selection of chemicals, Abrizan Company specialists, with more than 20 years of experience in advanced laboratories, are ready to provide customized solutions to various industries.

☎️Free call and consultation with Abrizan specialists☎️