Covers instantaneous consumption peaks
The hot water accumulated inside the calorifier covers the load drawn by several taps or showers at once, independent of the heat source's instantaneous capacity.
Product group · Pressure Vessels
Calorifiers (Single / Double Coil)
Coil calorifiers use hot water from a boiler or solar circuit, passed through an internal coil, to heat domestic water. Double-coil models allow two different heat sources (for example, a boiler and solar energy) to be connected to the same tank; we supply them with an insulated shell and a choice of enamel or stainless steel lining.
Volume100 – 2000 L
CoilsSingle / double
Operating pressure6 – 10 bar
LiningEnamel or stainless steel
Single-coil calorifier · indirectly heated hot water storage tank
Why it matters
What does a coil calorifier do?
It is the single connection point between the heat source and domestic water; it covers instantaneous consumption peaks.
A double coil combines two heat sources
A boiler and a solar circuit, for example, can be connected to the same tank; solar energy runs with priority while the boiler steps in as a backup source.
Prevents the boiler from constantly cycling on and off
Without a calorifier, the boiler would start and stop every time a tap is opened; this both lowers efficiency and shortens its service life.
Long service life with an enamel or stainless steel lining
The interior lining protects domestic water against scale and corrosion; anode protection extends the service life further.
Types
Sub-types of calorifiers
All three transfer hot water from the heat source to domestic water through a coil; what sets them apart is the number of coils and capacity.
Single-coil calorifier
Fed by a single heat source (usually a boiler); the standard solution for residential and small-to-medium commercial installations.
- Single heat source
- Economical solution
- Residential/commercial use
Double-coil calorifier
Combines two different heat sources (e.g. boiler + solar energy) in the same tank; the renewable source is prioritized while the boiler works as backup.
- Two heat source connections
- Solar-compatible
- Energy savings
Multi-source / large-volume calorifier
Custom-built calorifiers with large volume and a reinforced coil surface, meeting the needs of multiple heat sources or high-capacity installations.
- High volume capacity
- Custom-build options
- Suited to industrial installations
Selection criteria
What data determines the right calorifier?
Selection cannot be made without the first two items. The rest determine the number of coils and the lining material.
ParameterWhy it mattersWhat we need from you
Volume
Calculated from the number of simultaneous users and consumption habits.
L
Number of heat sources
Whether a single source (boiler) or two different sources (boiler + solar energy) will feed it.
1 / 2 sources
Coil surface area
Determined by the heat source's output and the desired heat-up time.
m²
Lining material
Enamel or stainless steel is chosen based on water hardness and usage intensity.
Enamel / stainless steel
Operating pressure
Must match the mains or booster-pump supply pressure.
bar
Connection size and installation location
Inlet/outlet and coil connection sizes, and the boiler room layout.
DN size + installation clearance
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- Number of simultaneous users, or the volume you need
- Whether a single or double coil is wanted
- Heat source(s) (boiler, solar energy, etc.)
- Water hardness (for the enamel/stainless steel choice)
- Operating pressure
- The existing calorifier's nameplate data (if replacing one)
FAQ
Questions from the field
The questions we hear most often when quoting calorifiers.
Should I choose a single or double coil?
If you have a single heat source (for example, just a boiler), a single coil is enough. If you will also bring in a second source such as solar energy, a double-coil calorifier combines both sources in the same tank.
Should I choose enamel or stainless steel?
If water hardness is low and budget is the priority, an enamel lining is enough. If water hardness is high, usage is intensive, or a hygiene standard is required (hotels, hospitals), a stainless steel lining gives a longer service life.
How is calorifier volume determined?
It is calculated from the number of simultaneous users, the number of showers/taps and consumption habits; too little volume causes hot water interruptions, while too much causes needless heat loss.
What is anode protection, and is it necessary?
In enamel-lined calorifiers, a magnesium anode protects the tank cathodically against corrosion; periodic inspection and replacement when needed extends the calorifier's service life.
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 equipment end to end, from a single source.
Next step
Let's clarify your needs together
Share your volume needs and the number of heat sources, and let's determine the right calorifier for your installation together.
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