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The OVB heat exchanger is designed for efficient heating of swimming pool water and water in hot tubs. Thanks to the use of stainless steel AISI 316, it offers high corrosion resistance and long service life even in demanding pool environments. It is suitable for use with gas boilers, heat pumps, and solar collectors and represents a reliable solution for both indoor and outdoor pools with sand filtration.
Not suitable for saltwater pools!
| Parameter | Value |
|---|---|
| Heating capacity | 20 kW |
| Material | Stainless steel AISI 316 |
| Pool circuit connection | 1 1/2" female thread |
| Heating circuit connection | 3/4" female thread |
| Application | Swimming pools and hot tubs (chlorinated water) |
We always recommend sizing the heat exchanger for a larger pool volume than the actual pool size. A 20 m³ pool represents the upper limit that this exchanger can handle effectively, and this applies mainly in situations with a large temperature difference between the heating circuit and the pool water – for example, 80 °C in the heating circuit versus 20 °C in the pool.
Pool specialist opinion – review
- + Fast and efficient heating of swimming pools and hot tubs (with correct flow rate)
- + AISI 316 stainless steel – high corrosion resistance in pool environments
- + Compatible with boilers, heat pumps, and solar collectors
- + Stable performance and long service life with proper water chemistry
- − Requires correct pH/chlorine levels and recommended flow rates (otherwise corrosion/erosion may occur)
- - NOT SUITABLE FOR SALTWATER POOLS – CHOOSE A TITANIUM HEAT EXCHANGER!
“OVB is a solid stainless steel heat exchanger that heats a pool quickly and efficiently – but only when the by-pass, flow rate, and water chemistry are set correctly. If these conditions are met, it is a reliable workhorse for many years.”
Poolservis team
OVB heat exchanger – professional pool heating without compromise
The OVB heat exchanger is designed for heating swimming pool water and water in hot tubs. It is most commonly used for pool heating with:
- gas boilers
- heat pumps
- solar collectors
Thanks to stainless steel AISI 316, it offers high corrosion resistance and long service life even in demanding pool environments.
How the heat exchanger works
Inside the exchanger body there is a bundle of small tubes through which heating water flows (primary circuit). Pool water (secondary circuit) flows around these tubes. Heat is transferred through the tube walls, allowing the pool to heat up quickly. Once the pool reaches the set temperature, the system switches off (controlled by a thermostat or automation).
Why water quality is crucial
The service life of the heat exchanger and the entire pool system is primarily influenced by water quality. Regular pH control, correct chlorine dosing, and properly functioning filtration significantly extend the lifespan of the equipment and increase bathing hygiene safety.
Operating conditions and recommendations (pool installer practice)
- Regularly check the water pH (ideally daily) and keep it within the recommended range.
- If you use a by-pass, adjust the valves to ensure the recommended flow rate through the exchanger – incorrect flow can cause corrosion or erosion.
- Keep the pool free of solid debris (leaves, grass, etc.), which degrade water quality and may increase pH.
Commissioning
Before start-up, check:
- Pressurized connections are tight and leak-free.
- The exchanger is properly mounted and connected according to the installation diagram.
- The heating circuit is filled and properly vented.
- Grounding is completed and residual current protection (30 mA RCD) is functional.
Start-up procedure:
- Start the filtration pump.
- Check circulation of pool water through the heat exchanger.
- Check filling and venting of the heating circuit.
- Switch on the residual current device (30 mA).
- Set the desired temperature on the thermostat (or automation unit).
- Verify correct operation of the control automation for heating and filtration.
Conditions that must switch off heating
- Lowering the set temperature on the thermostat.
- Switching off filtration or closing a valve (loss of flow).
- Switching off the heating button / heat demand.
For safe operation, a thermostat and a flow switch are required. If there is no flow, the flow switch shuts down heating to prevent overheating and deformation of piping. The thermostat prevents overheating of the pool above the desired temperature.
Important safety notice
Before performing any work on the circuit or electrical components, make sure the unit is disconnected from the power supply and the circuit is closed.
Connecting the OVB heat exchanger to the filtration and heating circuits
Secondary circuit (pool water): 1 1/2" female thread. It is recommended to use a brass fitting with a PVC tail, into which a 50 mm pipe is subsequently glued. Do not use PVC fittings directly on the exchanger thread – due to high temperatures, the thread may loosen and cause water leakage.
Primary circuit (heating water): 3/4" female thread.
Use the supplied mounting brackets to fix the exchanger to the wall.
Package contents
- Heat exchanger body
- 2× wall mounting brackets
- 2× clamps
We recommend purchasing these additional products for installation
Technical data – OVB 70 (20 kW)
| Parameter | Value |
|---|---|
| Heating capacity | 20 kW (temperature gradient 90/70 °C) |
| Pool circuit connection | 1 1/2" female thread |
| Pool water flow rate | 10.2 m³/h |
| Pool water pressure loss | 9.2 kPa |
| Heating circuit connection | 3/4" female thread |
| Maximum pressure | 1.72 MPa |
| Maximum heating water temperature | 208 °C |
| Heating water flow rate | 25 l/min |
| Heating water pressure loss | 7.5 kPa |
| Heat exchange surface area | 0.25 m² |
Pool installer tip: most common installation mistakes
- Too low or too high flow rate through the exchanger – always adjust the by-pass to the recommended flow.
- PVC fitting directly on the exchanger thread – may loosen at higher temperatures. Use a brass fitting.
- Incorrect chemical dosing (high concentration in one spot) – may damage metal parts and seals.
- Neglected filtration – sand and debris can severely damage the exchanger and piping.
Who is the OVB heat exchanger best suited for
We recommend the OVB heat exchanger wherever stable performance, high durability, and long-term reliability are required. It is suitable for chlorinated pools with sand filtration, whether for an outdoor family pool or an indoor pool installation.
Additional parameters
| Category: | Heating + Solinators |
|---|---|
| Weight: | 0.2 kg |
| Značka: | Vagnerpool |
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