In frost-prone areas, you'll need to ensure that the system you buy has frost protection. Otherwise, the water or fluid could freeze in the collector panels.
The water/glycol mixture used in most closed loop systems has anti-freeze properties.
In open loop pump systems, temperature sensors can turn the pump on to run water through the system before the collector panels freeze. However, this won't work during a power outage.
Some open loop thermosiphon systems have frost valves, which let the water flow through the collector panels when the temperature is close to freezing.
Frost tubes could also be considered on some systems. These enable the water in the collector panels to freeze without causing damage. The devices absorb any pressure build-up created by the water expanding or freezing.
Talk to your installer or supplier about what method is appropriate for the system you choose.
Read what our members have to say close
To save money on essentials and make buying decisions easy, you can't go past Consumer. We're proud to have over 65,000 members all enjoying our independent information online or in Consumer magazine.
Here's what some of them say...
"Just wanted to let you know that I find your site excellent! Easy to find my way around, everything at my fingertips - just a click away.
I only took out a 3 month membership as I wasn't sure but it is actually really easy to use and if I want it on paper I can print the
reports. Thanks again".
Denise Watkinson - Waitakere
"My mother (74) got a renewal letter from her insurance company for her car insurance, wanting $570. After reading
your article on car insurance, I contacted one of the companies you recommended, who quoted her $318 for the same
level of cover. I just wanted to stay thank you very much for your article, as it has saved my mother a substantial amount of money".
Adrian Lane - Kapiti Coast
"I've been a member to the magazine since 1997 and enjoy reading it a lot. I've found lots of helpful information on different issues...
Thank you for being so helpful".
Peter Kovalenko - Porirua
"I have been a member of the Consumer NZ for 20 or more years and have enjoyed much reliable advice.
I turn to their tests before making significant purchases".
Lyndal Print – Auckland
Join Consumer now and make your decisions easy on a huge range of products and services
- Over 500 reports, plus interactive tools and calculators
- Independent advice from NZ's trusted source of information
- Join over 65,000 members who help us get all NZers a fairer deal
from just $28
Previous: Pumps and controllers
