Separates the circuits
Lime scale and oxygen in mains water can't reach the boiler circuit. The boiler, exchanger and piping are protected from corrosion, and the boiler water treatment stays intact.
Product group · Heat Transfer Products
Gasketed Plate Heat Exchangers
A family of heat exchangers where metal plates are clamped together with gaskets in between. It can be opened for cleaning and expanded by adding plates when more capacity is needed — the most common solution for boiler rooms and domestic hot water lines.
Capacity20 kW – 5 MW
Design pressurePN10 / PN16 / PN25
Operating temperature−10 °C … +180 °C
Plate materialAISI 316 / Titanium
Counter-flow operation · gasketed plate pack, can be opened for cleaning
Why it matters
What does a gasketed plate heat exchanger do?
You never send boiler water straight to the tap. A gasketed plate heat exchanger physically separates the two circuits, transferring heat without mixing the water — and it can be opened for cleaning and expanded when needed.
Produces hygienic hot water
Because water is heated instantaneously, it isn't held in large volumes for long periods. The storage-related legionella risk drops significantly when the system is correctly configured together with an accumulation tank.
Saves space in the boiler room
For the same capacity, the plate type takes up far less volume than a shell-and-tube type. This becomes decisive in tight boiler rooms and retrofit projects.
Separates pressure zones
In high-rise buildings, static pressure at the lower levels puts strain on the boiler. By separating zones with an exchanger, you run each circuit at its own pressure.
Efficiency through a small approach temperature
The counter-flow plate geometry can reach an approach temperature of 2–5 °C. This is what pays off in waste heat recovery and low-temperature regimes.
Can be opened for cleaning, and expanded
In the gasketed type, plates can be opened and cleaned, serviced against scaling. When capacity needs grow, plates are simply added without changing the frame — brazed and shell-and-tube types don't offer this flexibility.
Types
Sub-types of gasketed plate heat exchangers
All three are gasketed and can be opened; what sets them apart is the gasket/plate material and frame design.
Standard gasketed plate
With stainless steel (AISI 316) plates and EPDM/NBR gaskets, the primary choice for boiler rooms, domestic hot water and district heating lines.
- The most cost-effective option
- Capacity can be increased by adding plates
- Gasket temperature limit ~140 °C (EPDM)
Semi-welded
One side of the channel is laser-welded, the other gasketed. For aggressive, corrosive or refrigerant-type fluids, this removes any contact between the gasket and the fluid.
- Preferred for refrigerant gases and aggressive chemicals
- Higher pressure and temperature resistance
- Semi-openable; serviced on one side only
Double-wall
A double-layer construction with a leak-detection gap between the plates. Used on lines where the risk of drinking water, food or toxic fluids mixing must be eliminated entirely.
- Eliminates the risk of cross-contamination
- A preferred choice for food and drinking water projects
- Lower thermal efficiency than the standard type
Selection criteria
What data determines the right gasketed plate heat exchanger?
Once the eight points below are clear, the choice narrows to a single model. We calculate whichever of these you don't already have.
ParameterWhy it mattersWhat we need from you
Thermal capacity
The amount of energy to be transferred. Oversizing raises the initial investment, undersizing costs comfort.
kW or kcal/h
Temperature regime
Inlet–outlet temperatures of the primary and secondary circuits. This directly determines the approach temperature and the number of plates.
e.g. 90/70 – 10/60 °C
Flow rate
The amount of fluid passing through each circuit. The number of plate channels and the connection diameter follow from this.
m³/h or l/s
Allowable pressure loss
Affects pump selection. Keep it low and the exchanger grows larger; keep it high and pump energy use rises.
kPa (typically 20–50)
Operating and design pressure
The PN class, based on building height and static pressure. In high-rise buildings this can be decisive on its own.
PN10 / PN16 / PN25
Fluid type and fouling
Water, a glycol mixture, steam, seawater or a process liquid. A fouling factor is added to the capacity as a margin.
Fluid + fouling margin
Plate and gasket material
The plate determines corrosion resistance, the gasket material determines temperature and chemical resistance. In water with high chloride content, stainless isn't enough and titanium is needed; above 140 °C, Viton is considered instead of EPDM.
AISI 316 / Ti · EPDM / NBR / Viton
Connection type and size
Compatibility with the existing installation. Flanged, threaded or welded, along with mounting clearance and service margin.
DN size + connection type
For a quote, having the following is enough
It's fine if you don't have all of it. We'll fill in the gaps together with you.
Create a quote request- Capacity, or building/facility size
- Boiler outlet and return temperatures
- Domestic water temperature and flow rate
- Number of building floors, or static pressure
- Fluid type (water, glycol, steam)
- Mechanical project or specification, if available
FAQ
Questions from the field
The questions we hear most often when quoting gasketed plate heat exchangers.
Should I choose standard gasketed or semi-welded?
For water/water applications where ease of service matters, standard gasketed is sufficient. If the fluid is aggressive, corrosive or a refrigerant gas, or the temperature/pressure exceeds the limit of a standard gasket, the semi-welded type is preferred.
How often should the plates be cleaned?
It depends on water hardness and operating temperature. In a properly treated circuit, problems may not appear for years; with hard mains water, an annual check is reasonable. The sign is clear: a drop in outlet temperature at the same regime, together with rising pressure loss, indicates scaling.
How is the gasket material selected?
EPDM is the standard choice for general-purpose water circuits (up to roughly 140 °C). For oily or hydrocarbon-containing fluids NBR is used, and for lines needing high temperature and chemical resistance Viton is considered.
What else is needed alongside the exchanger?
Usually a circulation pump, strainer, safety valve, expansion tank and a valve group for circuit separation. Bundling these into a single quote is an advantage for both compatibility and lead time — we can supply all of them.
Do you only serve Istanbul?
No. While our office is on Istanbul's Anatolian side (Ataşehir), we supply and ship across Istanbul's European side, the surrounding provinces and the Marmara region, and Turkey as a whole — covering your boiler room equipment end to end, from a single source.
Next step
Let's calculate the capacity together
Write to us with what you have, and we'll ask about the rest. Your quote will be ready within a business day.
Related products
Other related product groups
Complementary equipment you may need for your project.
All heat exchanger types
Overview including brazed and shell-and-tube plate heat exchangers.
Pumps
Pumps that circulate water through the exchanger circuit.
Valves & fittings
Isolation valves for circuit separation and maintenance.
Expansion tanks
An expansion tank that balances pressure in the closed circuit.