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ANSWERED: How does Solar Hydronic Heating work with Solar Power and a Tesla Powerwall

Solar Power Tesla Heat Pump Hydronic Heating

Can Hydronic Heating be Connected to Solar Power with a Tesla Powerwall?

The aim of this article is to help you understand

  • How Solar Power and Tesla Powerwall’s can be connected to a Hydronic Heating System
  • The Importance of kW requirements when considering this option
  • The importance of choosing a Hydronic ready Heat Pump
  • The installation and running costs involved in this option

How Solar Power and a Tesla Powerwall can be connected to a Hydronic Heating System

To connect a hydronic heating system to solar power you simply need to use an electric powered hot water system. These can be either a traditional electric boiler or a modern heat pump.

By adding a Tesla Powerwall or similar home battery system you are going to significantly decrease your running costs. This is due to the nature of needing warmth in winter, and there being less sun light to generate solar power at this time.

While this is all good in theory there is one very important number you need to be aware of that heavily impacts on installation costs. This number is the kW’s that your hydronic heating system requires.

Keep Calm Choosing a Boiler for Hydronic Heating is all about the kW

The Importance of kW requirements when considering this option

In another article, we have tried to explain the importance of the kW when choosing a boiler. When it comes to a solar powered hydronic heating system knowing the kW requirement of your home becomes very important when considering financial viability vs running costs and environmental impact.

The most important number when considering a solar powered hydronic heating system is twelve (12).

This is because beyond 12kWs you are getting more technical, need more equipment and are becoming far more expensive.

Beyond 12 kW’s

  • You require 3 Phase power for a heat pump (an electric boiler needs 3 phase beyond 8kW’s)
  • You will likely require a much larger solar panel system to provide enough power
  • You’ll also most likely need additional batteries to store the additional energy required so you don’t use main’s power
  • You’ll more likely use main’s power which will increase your running costs
  • The heat pump’s become very expensive

Our Immergas AUDAX heat pumps have very impressive Coefficient of Performance (CoP) ratings. The CoP is the best number to use when comparing other heat pumps. The CoP translates to how many kW’s a heat pump uses to reach the target kW. The less input kW’s the less requirement for more solar panel’s, batteries and mains power use.

The importance of choosing a Hydronic ready Heat Pump

There are some important differences between a heat pump and a heat pump that is manufactured specifically and only for hydronic heating.

They include

  • Inclusion of an expansion tank required for hydronic heating
  • Inclusion of a quality pump that is required for hydronic heating
  • That they not only run but to continue to perform at -10C
  • That they have a high CoP
Hydronic Boiler Cost Comparison Graph

The installation and running costs involved in this option

The installation and running costs involved in this option

Choosing to incorporate a solar powered hydronic system will cost you more to install. And as discussed above the higher the kW requirement for your home the more expensive your installation is going to be. You’ll need more solar panels, larger battery capacity and a larger more expensive electric boiler or heat pump.

Something to keep in mind is that heat pumps that produce a high kW are expensive when compared to an equivalent gas boiler. If you are already set on solar panels and batteries then this additional cost might be easier to accept.

The two most important questions you need answers so that you can make an informed decision are

  1. How many kW’s does your system require -> Get a quote and we’ll tell you
  2. What size solar power system and batteries do you need -> Take the kW requirement we give you to your solar supplier
If you have any questions please write them in the comments section so that we can help you and others with similar questions into the future.
2017-08-25T13:02:11+00:00