Which Solar Hot Water System is Best for Me?
Quick Answer:There are three main types of domestic solar hot water system you'll come across in Spain:
Thermosiphon: The simplest passive system, with the tank above the collector.
Integrated: The collector and tank are combined into one slim roof-mounted unit.
Forced Circulation: Uses a pump to move heat between the roof collector and a separate storage tank.
Which one suits most homes?
Thermosiphon (Passive)
Best when: you have suitable roof space and want a simple, proven system.
Natural circulation means there is no pump or circulation controller to operate. The tank sits above the collector, so the main consideration is whether the roof can accommodate the system appropriately. The main limitation is that the storage tank needs to be positioned above the collector so that natural circulation can take place. This makes the available roof space and the appearance of the installation important considerations.
Why we like it: simple, reliable, little to go wrong and no electricity is needed to circulate the water.
Integrated (Passive)
Best when: you want the benefits of passive solar heating but prefer a slimmer, more integrated appearance.
The collector and storage tank form a single unit, making the system particularly neat on the roof. It also avoids the separate large tank associated with a traditional thermosiphon.
Why we like it: compact, simple, passive and visually less obtrusive.
Forced Circulation (Active)
Best when: there is a specific reason the storage tank cannot be located on or immediately above the collector, or where a more complicated installation requires it for technical reasons.
The pump and separate tank provide installation flexibility, but also introduce additional components (pump, controls, sensors, etc.) which brings additional running and maintenance costs.
Does the tank have to be on the roof?
With a traditional thermosiphon system, the tank sits above the collector because the system relies on natural circulation. A compact system combines the tank and collector into one unit. A forced circulation system separates the two, allowing the storage tank to be installed elsewhere in the property.
Which Option is Best for You?
If you want a simple, proven, and cost-effective system, a thermosiphon system might be the way to go.
And if you want a modern, slim, space-saving solution that blends well with your roofline, the slim integrated panel systems offer a stylish alternative.
Forced circulation systems can be the right solution where installation requirements make a passive system impractical.
At Ambience, we normally recommend a thermosiphon or integrated system for domestic properties because they are simple, reliable, easy to install and maintain, and have lower overall costs. Which is best for you depends mainly on your roof, the space available and how you want the system to look.
What to do next
Ready to find out more about solar hot water for your home? Contact us today to arrange a free, NO OBLIGATION site visit. We can look at the available space and explain what your options are.