KondTherm DXR — Refrigeration heat, turned into hot water

The principle

Stop throwing away your condenser heat.

Every heat pump and every refrigeration plant rejects heat at its condenser — heat normally dumped to the air. KondTherm DXR puts that heat to work.

The refrigerant condenses directly inside the tank, against the sanitary water — no intermediate water loop, so the system runs at a higher COP.

◂ refrigerant in (hot gas)water up to 65 °C ▸

The deeper and more continuous the refrigeration, the more — and the hotter — the recovered heat. Low-temperature freezing rejects the most, at the highest gas temperature.

−40 °C deep freeze→ hottest recovery

Direct

refrigerant condensation (DX) — no water loop

10–210

kW, built from 10 kW modules

↑ COP

higher efficiency than water-to-water

Safety · EN 1717

A wall between the refrigerant and your water.

Every refrigerant path through the tank is a tube within a tube. The refrigerant flows in the inner copper tube; an outer wall surrounds it with a controlled gap.

If either wall is ever breached, the refrigerant escapes into that gap — visible at the connection — and can never reach the sanitary water. That is the principle behind EN 1717 potable-water protection.

CROSS-SECTIONrefrigerant flow ▸

REFRIGERANT ▸▸▸

potable waterleak-detection gaprefrigerant (inner tube)

The lower fitting reveals the inner tube inside the outer wall.

The essentials

Four points that matter.

Direct condensation (DX)

The refrigerant condenses directly inside the tank — no intermediate water loop, so the whole system runs at a higher COP.

Double-wall heat exchanger

Refrigerant and drinking water stay fully separated; any leak is led to a detectable gap and never into the water.

EN 1717

Modular 10–210 kW

Built from 10 kW double-wall exchanger modules — add modules to match the load, as one merged exchanger or several independent circuits.

Two internal linings

Choose AISI 316L stainless steel or carbon steel with a flexible polymer bio-ceramic coating — both suitable for potable water.

Construction

Pick the lining your water demands.

/316 · AISI 316L

Stainless steel

Premium grade for the most demanding water and the strictest hygiene.

Potable, sanitary & food-contact duty
Chlorinated or corrosive water
Marine applications
Bare interior — no coating required

/C · S235JR + lining

Polymer bio-ceramic

Carbon steel protected by an internal polymer bio-ceramic coating containing biocides.

Flexible, high adhesion — resists micro-cracking
Biocide content inhibits pitting corrosion
Sacrificial magnesium anode, or optional impressed-current anode
Certified to EN 12897

Technical data

Six sizes, up to 210 kW.

Model	Volume (L)	Ø w/o insul. (mm)	Ø w/ insul. (mm)	Height (mm)	Max exchangers ×10 kW	Max power (kW)
1000	1008	850	1050	2260	6	60
1500	1449	1000	1200	2360	9	90
2000	2158	1200	1400	2450	12	120
3000	3050	1400	1600	2560	15	150
4000	4051	1600	1800	2630	21	210
5000	5055	1600	1800	3130	21	210

Rated 6 bar / 95 °C · output configured by the number of 10 kW double-wall modules · custom builds available — dimensions and connection configurations to customer requirements.

Water temperature

From heat recovery the store reaches up to 65 °C, and the upper zone up to 70 °C where the hot discharge gas is desuperheated. The vessel itself is rated to 95 °C, and a connection for an electric element is provided for Legionella protection or a top-up.

Body & protection

Carbon steel S235JR (bio-ceramic lining + magnesium anodes) or AISI 316L (1.4404) stainless, with a 3–4 mm wall depending on model. Flanged inspection hatch for service, 5-year warranty.

Insulation

Four removable options: PL/PVC, PU/PVC, PL/ABS and the premium PS/ABS (100 mm graphite polystyrene, ErP-compliant — class B up to 500 L, class C to 2000 L).

Standards & references

Built to the European framework.

EN 1717

Potable-water protection

The double wall keeps refrigerant and drinking water apart.

EN 12897

Storage water heaters

The tank lining is certified to this standard.

PED 2014/68/EU

Pressure equipment

Applies to the refrigerant-side heat exchanger.

ErP · 814/2013

Ecodesign

Standing-loss limits for tanks up to 2000 L.

Where it fits best

Deep, continuous cooling meets large hot-water demand.

A few examples, not the full list. As a rule it suits any site where refrigeration runs around the clock and hot water is in constant demand.

Meat, poultry & abattoirs

82 °C sanitation + chilling

Dairy, cheese & ice-cream

CIP + deep freezing

Cruise ships & marine

chillers + potable DHW

Water parks & spas

dehumidification heat

Ice rinks & arenas

24/7 ice plant

Commissary kitchens

cold rooms + pot-wash

Refrigeration heat,
turned into hot water.