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The industry standard for solar fluid is a mix of propylene glycol and water. It's non-toxic, biodegradable and relatively stable. However, you should always mix as much water as possible with your Read more »
Before you begin laying Pex tubes into your heating area, you must prepare the ground. The area should be flat and level, with the insulation in place and a vapor barrier under the insulation. If you Read more »
Articles from A to Z
AC Power and Controls in Solar Thermal Installations
Active and Passive Solar Space Heating
Additional Solar Thermal System Sizing Considerations
Advantages of Solar Thermal Systems
Air-Based Solar Thermal Space Heating
Basic Principles of Solar Thermal Systems
Calculating Flow Rate and Head in Solar Thermal Systems
Calculating Heating Load for Solar Thermal Systems
Calculating Hot Water Load for Solar Thermal Systems
Can I Heat my Water with an Air-Based Solar Thermal System?
Can I Integrate a Forced-Air Heating System with Solar Thermal?
Checking the Roof Before Mounting Solar Collectors
Chose the right Contractor for your Solar Heating System
Climate Considerations for Solar Collectors
Comparing the Cost of Renewable and Non-Renewable Water Heating
Compelling Reasons for Renewable Energy
Control Systems for Air-Based Space Heating
Controls for an Integrated Forced-Air and Solar Thermal Setup
Controls for an Integrated Hydronic and Solar Thermal Setup
DC Power and Controls in Solar Thermal Installations
Differential Temperature Controller Maintenance
Differential Temperature Controllers for Solar Thermal Systems
Diversion Loads in Solar Thermal Space Heating
Do We Have Enough Fuel For The Future?
Drainback Solar System Pumps
Drainback Solar Thermal Space Heating Systems with Storage
Drainback Solar Thermal Space Heating Systems Without Storage
Drainback Solar Thermal System Design
Drainback Solar Thermal System Heat Exchangers
Drainback Solar Thermal System Maintenance
Drainback Solar Thermal System Pros and Cons
Drainback Solar Thermal System Tanks
Drainback Solar Thermal Systems
Draindown Solar Thermal System Pros and Cons
Draindown Solar Thermal Systems
Evacuated Tube Collector Parts
Evacuated Tube Collectors
Evacuated Tube Collectors with Heat Pipes
Financing for Solar Systems
Flat Plate Collector Parts
Flat Plate Collector Structure
Flooded Open-Loop Solar Thermal System Pros and Cons
Flooded Open-Loop Solar Thermal Systems
Fossil Fuels – The Real Cost
Ground Mounts for Solar Collectors
Heat Exchangers for Solar Thermal Systems
Heat Your Pool with Solar Power
Heating Swimming Pool with Solar Power
Heating Your Home with Solar Energy
High Mass Solar Thermal Space Heating
High Mass Solar Thermal Space Heating Layout
How do Solar Hot Water Systems Work?
How do Solar Water Heating Systems Operate?
How Durable is a Solar Collector?
How Efficient is a Solar Collector?
How much does a Solar Heating System Cost?
How much does a Solar Hot Water System Cost?
How much Water does my Home use?
How to Calculate Pex Length for Radiant Heating
How to Charge a High-Mass Solar Thermal System
How to Charge a Pressurized Solar Thermal System: Step 1
How to Charge a Pressurized Solar Thermal System: Step 2
How to Charge a Pressurized Solar Thermal System: Step 3
How To Choose The Right Solar Thermal Pump - An Example
How to get Solar Collectors onto the Roof
How To Ground a Solar Thermal Collector Array
How to Install a Solar Pool Heating System
How to keep your Pool warm
How to Lay Pex Tubes in a Concrete Slab for Radiant Heating
How to Lay Pex Tubes in a Sand Bed for Radiant Heating
How to Measure, Cut and Clean Copper Pipe Runs
How to Plan Your Solar Thermal Installation
How to Prepare Pex Tubes for Radiant Heating
How to Roof-Mount your Solar Collectors
How to Set Up a Storage Tank for Solar Thermal Space Heating
How to Size a Solar Thermal Space Heating Collector Array
How to Size a Solar Thermal Space Heating System
How to Size a Solar Thermal Storage Tank and Collector Array
How to Size an Air-Based Solar Thermal Heating System
How to Solder Copper Pipes
How to Test a Solar Thermal Installation
How to work out Solar Collector Tilt Angles
ICS Solar Thermal System Maintenance
Integral Collector Storage
Integral Collector Storage Solar Thermal System Layout
Integral Collector Storage Solar Thermal System Pros and Cons
Integrating Solar Thermal and Grid-Tied Heating
Integrating Solar Thermal Space Heating with Hydronic Systems
Is a Solar Thermal System Worth the Investment?
Is an AC or DC Solar Thermal Installation Better?
Large Hot Water Storage Tanks
Layout Patterns for Radiant Floor Tubing
Liquid-Based Solar Thermal Space Heating Systems Without Storage
Liquid-Based Solar Thermal Systems for Space Heating
Living with High-Mass Space Heating
Mounting Heat Exchangers
Mounting Solar Thermal Collector Arrays
Multiple Storage Tanks in Solar Space Heating
Non-Integrated Solar Thermal Heating Systems
Operation of a Solar Hot Water System
Pipe Size and Fluid Volume in Solar Thermal Systems
Planning Your Solar Thermal Installation
Plumbing Roof-Mounted Solar Collector Arrays
Positioning Solar Thermal Collectors
Preparing for Plumbing
Preparing Roof Space for Solar Collector Arrays
Pressure Concerns in Pressurized Solar Thermal Systems
Pressurized Solar Thermal Space Heating Systems with Storage
Pressurized Solar Thermal Space Heating Systems Without Storage
Pressurized Solar Thermal System Basics
Pressurized Solar Thermal System Considerations
Pressurized Solar Thermal System Layout
Pressurized Solar Thermal System Maintenance
Pressurized Solar Thermal System Pros and Cons
Pressurized Solar Thermal System Pumps
Pressurized Solar Thermal System Thermosiphoning
Pumps for Solar Thermal Systems
Recirculation Solar Thermal System Pros and Cons
Recirculation Solar Thermal Systems
Refrigerant-Based Solar Water Heaters
Roof Boots, Posts and Rails
Sensors for Solar Thermal Control Systems
Shading Considerations for Solar Thermal Collectors
Shipping Solar Collectors
Sizing Pumps in Solar Thermal Systems
Solar Collector Mounting Essentials
Solar Energy Heating and Cooling
Solar Fluids in Solar Thermal Systems
Solar Hot Water Collector Types
Solar Hot Water System Design
Solar Hot Water Systems
Solar Powered Hot Water in Your House
Solar Swimming Pool and Air Collector Maintenance
Solar Thermal Equipment: Thermostats and Unions
Solar Thermal Equipment: Vents and Vacuum Breakers
Solar Thermal Expansion Tanks
Solar Thermal for Pool Heating
Solar Thermal Hot Water Explained
Solar Thermal Investment
Solar Thermal Pipe Insulation
Solar Thermal Plumbing Toolkit
Solar Thermal Pressure Gauges and Thermometers
Solar Thermal Radiant Floor Heating Adjustment
Solar Thermal Space Heating Basics
Solar Thermal Storage Tanks
Solar Thermal System Check Valves
Solar Thermal System Valves
Solar Thermal Systems for Indoor Pool Heating
Solar Thermal Systems for Seasonal Pool Heating
Solar Thermal Systems for Spas and Hot Tubs
Solar Thermal Systems throughout History
Solar Water Heating
Storage for Solar Thermal Systems
Storage Tanks for Solar Thermal Space Heating
Sun, Earth and Solar Siting
Tanks and Collectors for Solar Thermal Systems
The Best Solar Collector
The Importance of Planning a Solar Thermal Installation
Thermosiphon Solar Thermal System Basics
Thermosiphon Solar Thermal System Layout
Thermosiphon Solar Thermal System Pros and Cons
Three Simple Steps to Save Water and Money
Tools to Define the Solar Window
Two-Minute Monthly Solar Thermal System Maintenance
Types of Air-Based Solar Thermal Space Heating
Types of Solar Thermal System
Using Propylene Glycol in Solar Thermal Systems
Venting Pressurized Solar Thermal Systems
What are Drainback Solar Thermal Systems?
What are Active and Passive Solar Thermal Systems?
What Are Air-Based Solar Collectors?
What are Solar Thermal Storage Tanks?
What is a Net Zero Home?
What is a Solar Thermal System?
What is Active Solar Heating?
What is an Integral Collector Storage System?
What is Passive Solar Heating ?
What Types of Pipes Does my Solar Thermal System Need?