For Professionals
Find installers now!
Get free local quotes
Cut your energy costs
Improve your home's value
  • Projektdaten
  • Angebote
Project Type
Please fill out this field
Please fill out this field
Area to be heated
Please fill out this field
Type of Solar Thermal
Please fill out this field
Your Utility Company
Please fill out this field
Avg. Monthly Electric Bill
Please fill out this field
Property Type
Please fill out this field
Type of Area
Please fill out this field
Choose the status of your project
Please fill out this field
What is the Timing of your project
Help contractors to schedule your inquiry
Please fill out this field
Fachbetriebe finden & kostenlos Angebote anfordern
Complete your request to receive free local quotes
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
Please fill out this field
    Please fill out this field
    3 min. left

    Hot Water Storage Tank For Solar Hot Water Systems

    A solar hot water system requires a hot water storage tank that keeps the water at a high temperature. The amount of space available plays an important role when choosing a solar hot water system. All system designs require extra storage volume and an adequate location for the storage cylinder.
    Find the right installer
    • Find Licensed Contractors in your Area
    • Receive up to 5 Offers from Contractors
    • Guarantee Best Price, No Fees and Without Obligation!

    Conventional heating systems can be adapted by placing a separate pre-heat cylinder between the existing cold water feed and the normal hot water storage. The other option is to replace an existing hot water storage cylinder with a larger double heat exchange cylinder. In a passive solar hot water system, the hot water storage tank must be located above the collector level.

    Selecting The Type of A Hot Water Storage Tank

    In a two-tank system, water is heated with solar collectors and then stored in the first tank (a pre-heat tank) before it enters the conventional water heater. A one-tank system is made up of a single cylinder with twin coils-- a combination of a solar storage tank and a back-up heater.

    The three types of hot water storage tanks are: vented, mains pressure, and thermal store. Mains pressure cylinders and thermal store cylinders enable hot water to be maintained at the same pressure as the mains supply. However, these two types tend to be more expensive.

    Conventional Boilers Are Not Always Suited For Solar Hot Water Storage

    Conventional boilers, such as efficient condensing boilers, are often unsuitable for solar water storage. These boilers are designed to take in cold mains-pressure water, and then solar systems supply hot or warm water at a lower pressure. For solar hot water storage, an additional tank or boiler replacement may be required. Furthermore, most solar water heaters require a well-insulated storage tank where an additional outlet and inlet are connected to and from the collector.

    Recent developments offer the possibility to connect a solar hot water system directly with a boiler without replacement. Contact a solar professional in your area to check if your boiler or tank is suitable.

    Solar Hot Water StorageHot Water Storage Cylinder. Source: National Renewable Energy Laboratory

    Size of A Hot Water Storage

    Your hot water storage tank should be big enough to store 40 - 60 liters per day per person. Calculate with 200-300 liters per day for a family of four. Solar Collectors can typically produce a minimum of 80 -100 liters per m² of collector that flows in the water storage tank.

    We find the company that suits to your needs
    • More than 6.000 Licensed Contractors
    • Get Informed, Compare Prices and Get the Best Offer
    Written by: Christian Märtel, Editor