Boiler Expansion Tank: A Comprehensive Guide

An expansion tank helps manage the pressure inside a boiler. It doesn’t store extra water for heating. It is usually found on top of the hot water tank. If you look at your boiler, you’ll see a smaller tank connected to a pipe from the main tank.

It was invented to prevent rust in the main tank. Old used an air cushion inside the tank, but this let in too much oxygen, causing rust. This keeps air and water separate to stop this from happening.

What is a Boiler Expansion Tank?

It is a crucial component in a heating system. Thus, its primary function is to absorb the extra pressure created when water is heated in a boiler. Without a tank, the increased pressure could damage other parts of the heating system.

When the water pressure increases, it pushes against the diaphragm and relieves pressure from the main tank. Conversely, when the water pressure decreases, the air pressure pushes back to restore balance. Furthermore, this system ensures stable operation. Consequently, any fluctuations are promptly managed.

How an Expansion Tank Protects Your Heating System

It is usually connected to the water line between the boiler and radiators.

During Heating:

  • When it heats the water usually expands.
  • This increased water volume pushes into the upper half of the expansion tank.
  • The rubber diaphragm moves down to make space for the extra water.
  • This action moderates the pressure, preventing damage and avoiding the use of relief valves.

During Cooling:

  • Firstly, When the system cools down, on the other hand, the water volume decreases.
  • Secondly, the air pressure in the lower half pushes the rubber diaphragm back up.
  • Thirdly, this forces the water from the upper half back into the system.
  • Lastly, this process keeps the water volume safe and prevents air from entering the system.

Types of Boiler Expansion Tanks

There are two main types:

  1. Diaphragm: These have a rubber diaphragm that separates the water from the air. This type is common in modern systems.
  2. Bladder: These have a bladder that holds the water, keeping it separate from the air.

Why is an Expansion Tank Important?

It helps maintain consistent pressure in the boiler system. It prevents the risk of overpressure, which can cause leaks or bursts in the system. By managing pressure, the boiler system expansion tank ensures the boiler operates efficiently and safely.

Boiler Expansion Tank Installation

Installing involves a few key steps:

  1. Turn Off the Boiler: Before starting, firstly make sure the boiler is turned off and cooled down. Additionally, this precaution is crucial for safety.
  2. Drain the System: Drain enough water from the system to accommodate the new tank.
  3. Install the Tank: Connect the changing expansion tank to the boiler system, typically near the boiler itself. Follow the manufacturer’s instructions for proper installation.
  4. Refill and Test: Refill the system with water and test for any leaks. Check the pressure to ensure everything is working correctly.

How To Replace an Expansion Tank on A Boiler?

Over time, however, it may eventually need to be replaced due to wear and tear. Here’s how to replace it:

  1. Turn Off and Cool Down: Safety first. Make sure the boiler is off and cool.
  2. Drain the System: Drain the system to remove water from the expansion tank.
  3. Remove the Old Tank: Disconnect the old one carefully.
  4. Install the New Tank: Attach the new one, ensuring all connections are secure.
  5. Refill the System: Refill the boiler system with water, and check for leaks and proper pressure.

Sizing a Boiler Expansion Tank

Choosing the right size for an expansion tank for a boiler is important for efficient operation. The size depends on the capacity and the system’s pressure. Manufacturers often provide guidelines to help you select the correct size.

Troubleshooting Common Issues

Boiler Tank Full of Water

If the expansion tank boiler is full of water, it may not be able to absorb the pressure correctly. This usually indicates that the diaphragm or bladder needs replacement.

Boiler Expansion Tank Pressure

The pressure should match the boiler’s pressure. Typically, this is around 12-15 psi for residential systems. Always use a pressure gauge to check and adjust if necessary.

Location of the Boiler Expansion Tank

It is usually installed close to the boiler, often on the hot water supply line. This allows it to be effectively managed and is equally important because the pressure changes in the system.

How to Change an Expansion Tank on a Boiler

  1. Turn Off the Boiler and Cool Down: Ensure the boiler with the expansion tank is off and the system is cool.
  2. Drain the System: Meanwhile, drain enough water to allow for the removal of the old tank.
  3. Remove and Replace: Also, disconnect the old tank and attach the new one.
  4. Refill and Check: Lastly, refill the system, check for leaks, and ensure proper pressure levels.


It is a vital part of any heating system, helping to manage pressure and ensure safe operation. Whether installing a new tank, replacing an old one, or troubleshooting common issues, understanding the basics of boiler expansion tanks can significantly help keep your heating system running smoothly.

Additionally, this knowledge can prevent potential problems and ensure efficient operation. Always follow safety guidelines and manufacturer instructions, and consult a professional if needed.

Furnace Sizing and Maintenance: A Comprehensive Guide

Furnace sizing is crucial to ensure that your home stays comfortable during the colder months. The size of the furnace determines its ability to heat your home efficiently. A furnace that’s too small won’t heat your home adequately, while one that’s too large will waste energy and money.

This article covers various aspects of furnace sizing, from calculators and charts to maintenance tips.

Furnace Sizing Calculator

A furnace sizing calculator is a helpful tool that uses information about your home, such as its size, insulation, and local climate, to estimate the ideal furnace size. Many online calculators ask for:

  • Square footage of your home
  • Insulation Quality
  • Number of windows and doors
  • Local climate zone

By inputting this information, the calculator provides a recommended furnace size in British Thermal Units (BTUs). Furnace BTU Sizing measures the heat output of a furnace so use a BTU calculator or chart to match your home’s heating needs with the furnace’s capacity.

Sizing a Furnace

When sizing a furnace, it’s important to consider the entire living space of your home. This includes all rooms that you want to heat effectively. For accurate sizing, follow these steps:

  1. Measure the Square Footage: Calculate the total square footage of your home.
  2. Assess Insulation and Windows: Better insulation and energy-efficient windows reduce the furnace size needed.
  3. Climate Consideration: Colder climates require more powerful furnaces.

Annual Furnace Maintenance Checklist

A typical maintenance checklist includes:

  • Replacing air filters
  • Inspecting and cleaning the blower
  • Checking electrical connections
  • Lubricating moving parts
  • Inspecting the heat exchanger

To find annual furnace maintenance near you, search online or ask for recommendations from friends and neighbours. Ensure the technician is certified and experienced.

Furnace Sizing Guide

A detailed furnace sizing guide might include:

  • Square Footage Breakdown: Different ranges for different home sizes.
  • BTU Requirements: Detailed BTU requirements per square footage.
  • Adjustment Factors: Considerations for insulation, windows, and climate.

Furnace Sizing Chart

A furnace sizing chart offers a quick reference based on your home’s square footage and climate zone. Here’s a simplified example:

  • Mild Climate (Zone 1):
    • 1,000 sq ft: 30,000-45,000 BTUs
    • 2,000 sq ft: 60,000-90,000 BTUs
  • Cold Climate (Zone 5):
    • 1,000 sq ft: 50,000-60,000 BTUs
    • 2,000 sq ft: 100,000-120,000 BTUs

Counting the Basement in Furnace Sizing

Whether to count the basement when sizing a furnace depends on whether it’s a livable space that requires heating. If you plan to heat your basement, include its square footage in your calculations.

If the basement is finished or will be used as a living area, heating is important for comfort and to prevent issues like pipes freezing. However, if the basement is unfinished and you don’t plan to heat it, you don’t need to include its size when sizing your furnace.

 Always consider your specific needs and how you’ll use the space when deciding.

  1. Garage Furnace Sizing

For garages, sizing depends on their use (storage vs. workshop) and insulation. Typically, a smaller unit suffices unless the garage is used as a workspace or has poor insulation.

  • Gas Furnace Sizing

Gas furnaces are commonly sized using the same principles but may have specific efficiency ratings (AFUE). A high-efficiency gas furnace might require slightly different sizing compared to a standard unit.

Sizing a Furnace for a House

Electric furnaces are sized similarly to gas furnaces but consider electrical requirements and efficiency. Ensure your home’s electrical system can support the furnace’s power needs.

 To size a furnace for your house:

  1. Calculate Total Square Footage: Include all heated areas.
  2. Determine BTU Requirements: Use climate zone and insulation quality.
  3. Select the Furnace: Choose a furnace with the closest BTU output.

Annual Furnace Maintenance

Regular maintenance is essential to keep your furnace running efficiently. For gas furnaces annual maintenance, includes checking the gas lines, burner, and heat exchanger for leaks or damage. It’s crucial for safety and efficiency.

Annual maintenance typically includes:

  • Inspecting and cleaning the furnace
  • Checking and replacing filters
  • Ensuring proper ventilation
  • Testing the thermostat

The annual furnace maintenance cost varies but generally ranges from $75 to $200. This cost can be higher if repairs or parts replacement are needed.

Do Gas Furnaces Require Annual Maintenance?

Yes, gas furnaces need yearly maintenance. This keeps them running safely. A technician will clean and check the furnace, making sure everything is working well. This can prevent dangerous problems like gas leaks and can help the furnace last longer.

If you skip annual maintenance, your furnace might not work as well, which can raise your energy bills. It could also break down unexpectedly, costing a lot to fix. Regular check-ups catch small problems early, so your furnace works when you need it most, especially in the winter.


Proper furnace size and regular maintenance are important for keeping your home warm and safe. Use tools like furnace size calculators and charts to determine the right size for your home, and don’t skip on annual maintenance to ensure your furnace operates efficiently year-round.

Air Conditioner Tune Up: What Is It and Do You Need One?

Many homeowners think that servicing an air conditioner when it seems to be working fine is a waste of time and money. However, taking care of your AC before problems arise can save you both time and money in the long run. Regular maintenance is like an investment that pays off with significant benefits over time.

What Is an Air Conditioner Tune Up?

An air conditioner tune up is a routine maintenance service for your air conditioning system. It involves checking, cleaning, and adjusting various components to ensure your AC runs efficiently and effectively. Regular tune-ups can extend the life of your air conditioner, improve its performance, and help you avoid costly repairs.

  • Extends Lifespan: Proper care can help your AC last longer.
  • Improves Air Quality: Cleaning the system can remove dust and allergens, making the air in your home cleaner.

Why Regular Air Conditioner Maintenance is Important

Here are some of the reasons why maintenance is important:

Improve Energy Efficiency

Regular tune up air conditioner help you run more efficiently. Just before summer, a tune-up can make your AC work better in the hot weather, which can lower your energy bills. Over time, all air conditioners become less efficient, especially as they get older. Regular maintenance helps keep your AC efficient for a longer time, saving you money on electricity.

Find Hidden Problems

A thorough tune-up includes a complete check of your AC system. A skilled technician can find any hidden problems that you might not notice. Often, AC issues can go unnoticed until they cause a big problem. Regular tune-ups let you fix small issues before they turn into expensive repairs, which is good for both your wallet and your AC.

Avoid System Breakdowns

When the first heatwave of summer hits, many homeowners find their air conditioners suddenly stop working. The extra strain on the AC during hot weather can cause it to break down. But you can avoid this by getting a tune-up in the spring. This maintenance prepares your AC for the summer heat, reducing the risk of unexpected failures. By getting a tune-up before the hot season, you can make sure your AC will keep you cool when you need it most.

What Does It Include?

A typical air conditioner tune up checklist includes:

  • Checking and replacing the air filter
  • Cleaning the condenser and evaporator coils
  • Inspecting the thermostat settings
  • Lubricating moving parts
  • Checking the refrigerant levels
  • Inspecting the ductwork for leaks
  • Ensuring the system cycles on and off correctly

Cost of an Air Conditioner Tune Up

The air conditioner tune up cost can vary based on your location and the specific services provided. On average, you can expect to pay between $70 and $200. Some companies offer specials or discounts, especially during the off-season, so it’s a good idea to look for them near you.

Taking advantage of these offers could potentially lower your expenses. It’s always wise to explore local options to find the best deal that suits your budget and needs.

Finding an Air Conditioner Tune Up Near You

To find a reliable service provider, you can search online for “air conditioner tune up specials near me” or check local listings. Be sure to read reviews and ask for recommendations from friends or family. You can also check big home improvement stores which may offer these services.

Air Conditioner Tune up Specials

Many HVAC companies offer specials or discounts on tune-ups, especially in the spring and fall when they encourage customers to prepare for the upcoming season. Searching for “air conditioner tune up specials near me” can help you find the best deals.

If you have a central air conditioning system, regular tune-ups are crucial. Central air systems are more complex and typically require professional maintenance. The central air conditioner tune up process includes checking the outdoor unit, the indoor unit, and all related components.

Furnace and Air Conditioner Tune-Up

Some companies offer combined tune up services for both your furnace and AC. This can be a convenient and cost-effective way to ensure your entire HVAC system is running smoothly. Combined services usually cost a bit more but provide comprehensive maintenance for both systems.

It can save you time and hassle, as you only need to coordinate with one service provider for both appointments. This streamlines the process and ensures that your heating and cooling systems receive the attention they need to function optimally throughout the year.

Home Air Conditioner Tune Up Services

Home air conditioners, whether they are window units or central systems, benefit greatly from regular tune-ups. Keeping your home air conditioner tune up and in top shape ensures comfort during the hot months and prevents unexpected breakdowns.

It often partners with local HVAC professionals to offer tune up services. You can inquire at your local store or check their website for available services and any current specials.


It is an essential maintenance task that keeps your AC running efficiently, extends its lifespan, and improves indoor air quality. Regular tune-ups can save you money in the long run by preventing major repairs and reducing energy costs. Whether you choose a local HVAC service or a big store, make sure to take advantage of specials and schedule your tune-up regularly.