Choosing from Open Loop and Closed Loop Solar Pool Heating Systems
                     Choosiing  ffrrom  Open  Loop  and  Cllosed  Loop  Sollarr  Pooll  Heattiing  
Systtems
When it comes to investing in 
solar pool heaters, you 
need to choose between an 
open loop and a closed loop 
system. Both systems work 
efficiently to get the job done 
and are specific to the 
individual requirements of 
both commercial and 
rTehseid esnotilalr -poowl eorwedn ersy. stems 
will save you money through 
electricity bills and help you 
reduce your carbon footprint. 
With the advancement in 
technology, people are 
looking for new efficient ways 
to use the natural resources 
available to them. Hence, you 
should switch to a solar pool 
heating system to turn heat 
energy from the sun to heat 
your pool at the desired 
temperature for you and your 
family.
Underrsttandiing  tthe  Diifffferrences  Bettween  Botth  
Systtems  ––
Open  Loop  Sollarr  Pooll  Heattiing  Systtem
An open-loop solar pool heater helps in heating water directly from the pool 
when you add it to the existing loop system. During the operation, the water 
circulates through the solar collectors in the existing filter and heating loop. 
When the energy is required for heating the pool, the water will flow inside 
the filter and existing heating heater and then top up which is needed for 
heating water to the desired temperature.
If the solar system is providing the 
much-required temperature, you 
won’t require a secondary backup 
heater. When your pool is at the 
needed temperature, the system 
bypasses the solar loop to prevention 
against overheating.
Advantages –
•Lower installation costs
Disadvantages –
•Less accuracy and reliability
•More energy consumption by pool heating pump
•Unable to work in cloud or cold weather
•Damaged by harmful chemicals or saltwater
•Frequent leakage and damaged roof
Cllosed  Loop  Systtem  ––
A closed-loop pool heating system 
is a pressurized system that 
separates from the pool loop. 
Rather than using water, the fluid 
present in the solar collectors is an 
eco-friendly antifreeze solution 
that contains water, propylene, 
and glycol. The solution circulates 
throughout the collectors and 
transfers the heat energy to the 
pool water through a titanium or 
stainless steel heat exchanger.
The pool circuits are connected in parallel through the heat exchanger where 
the solar energy is transferred to the pool water through the solar collector. 
The existing heating system supplies any additional energy required before 
going back to the pool. To prevent the system from overheating, the 
circulation pump turns off by putting the system into a stagnation state.
The fluid present in the collectors changes its state to steam which is then 
absorbed by the expansion tank in the loop. This type of system works 
efficiently in colder climates and year-round pools as well as indoor solar pool 
heating installations.
Advantages –
•More reliability and accuracy
•Smaller circulation pump and usage of less energy
•Useful year-round for indoor and outdoor operation
•Easy integration into multiple systems including in-floor radiant 
DHW
•Longer life expectancy
•No interaction with pool chemicals
Disadvantage –
•Higher initial cost
When deciding which solar pool heating system works for you, it comes down 
to the factors that depend on what is best for your setup. If you have to pick 
up the system which is the most reliable and uses advanced solar 
technology, the closed-loop system must be the choice.
Shop for the closed loop solar pool heaters from 
Northern Lights Solar Tubs and consider heating your pool by using the 
highly advanced and efficient technology ensuring maximum profits and 
optimal return on your investment. For more details, feel free to get in touch 
with us at 1-800-759-8990.
Northern Lights Solar Solutions
1-800-317-9054
305 McKay Unit 20
Winnipeg
Manitoba
R2G0N5
Website: www.solartubs.com
 Thank You