Swimming pool heat exchanger buying guide
Patrick, Handyman, Bath11 guides
- Water volume
What exactly is a heat exchanger?
A pool heat exchanger has two water circulation circuits:
- A "primary" circuit, connected to the property's central heating;
- A "secondary circuit", in which the swimming pool water circulates.
That's all there is to it!...
How does a pool heat exchanger work?
To use a pool heat exchanger, two conditions must be met:
- You must have a domestic boiler;
- This must be installed close to the pool and machine room.
If you only heat your pool when you're not using the central heating (e.g. in the summer), then your boiler should definitely be powerful enough. However, you'll need to think more carefully if you want to heat your pool while the central heating is in use (for an indoor pool, for instance).
How to size your pool heat exchanger?
The required power of the heat exchanger depends on the size of the pool and the temperature rise time you're aiming for.
In general, the devices are scaled so as to gain 10°C in 2 days.
Minimum heat exchanger power
So, calculate your required power value, but don't be too thorough. Over-sizing a pool heat exchanger will add to its purchase cost; once the desired temperature is reached, less heating power is required to maintain it. Also think carefully about temperature rise time: a large inground swimming pool doesn't necessarily need to reach the optimum temperature in 2 days, whereas a small above-ground pool for occasional use only will need to be heated quickly.
Important: recommended power values are given for an assumed primary circuit water temperature. In reality, this temperature will vary according to the characteristics of your central heating. A boiler will deliver water at a higher primary temperature than a heat pump - usually 90°C as opposed to 45°C. Also, if you want to connect a heat pump, check that your heat exchanger is compatible with the temperature of your primary network.
What other factors are important when choosing your pool heat exchanger?
Pool heat exchangers require minimal flow.
It's essential to ensure compatibility between your boiler and exchange circulator.
Flow rate must not exceed a certain maximum value, so installation of a bypass is essential.
What are the different types of pool heat exchanger?
- Tubular heat exchangers - where the water circulates in tubes;
- Plate heat exchangers - where heat exchange is achieved via parallel radiating plates, one of which belongs to the primary circuit and the other to the secondary circuit.
Final advice on choosing your pool heat exchanger
Learn more about swimming pool equipment...
How to choose your swimming pool liner?
How to choose your pool cleaning products?
How to choose your pool maintenance products?
How to choose your pool robot?
How to choose your pool cover?
How to choose your pool filtration system?
How to choose your pool heat pump?
How to choose your pool heat exchanger?
How to choose your electric swimming pool heater?
How to choose your pool alarm?
How to clean your pool?
How to filter your pool?
How to cover your pool?
How to heat your pool?
How to secure your pool?
How to choose your pool?
Patrick, Handyman, Bath 11 guides écrits
It's also a family affair. I love nothing more than spending weekends in the workshop with my kids, who have inherited my love of tinkering. We motivate each other and share ideas about different projects - most of which are successful, I'm not shy to admit. But that’s one of the best parts of a DIY lifestyle: working together and having fun doing it.
By the way, should you ever need some advice or guidance, I'm happy to help you, too!