In heat-pump renovations, lowering the flow temperature raises the system’s annual efficiency. Asensi systems enable low flow temperatures in new-build and renovation projects.
Sludge and rust inside a heating system act as insulation. They force the boiler or heat pump to work harder and waste energy. This hidden dirt leads to higher bills, cold spots in the home and, eventually, expensive equipment failures.
A clean system pays for itself
Lower energy bills
A clean system transfers heat efficiently and saves money.
Reliable comfort
Quiet, even heat without strange noises or cold rooms.
Protect your investment
Ensure the longevity of your home’s most expensive system, the heat pump or boiler.
Household tax credit
The Finnish household deduction is available on the labour share.
Example: 150 m² house, from oil to ground-source heat
When old steel radiators are replaced with Aleternum aluminium radiators and the heating circuit gets Elysator corrosion protection plus PUROTAP demineralisation, the flow temperature can be lowered and heat-pump efficiency improves.
Example calculation. Project-specific values are always calculated per project.
Calculate your own project: Heating calculator →How Asensi systems improve energy efficiency
Radiator calculator
The calculator computes Aleternum radiator output for different flow, return and room temperatures. You will find it on the radiators page.
Open the radiator calculator → Request a quote →How does it work?
Water quality is the foundation of everything
Poor circulating water is the number one cause of falling efficiency, noise problems and premature equipment failure.
Sludge and corrosion
Dissolved oxygen and impurities generate sludge in the system, which blocks valves, radiators and heat exchangers and significantly reduces heat transfer.
The warranty can lapse
Many equipment manufacturers, heat pump suppliers among them, require the water quality to comply with the standards (VDI 2035 in particular) for the warranty to remain valid.
Insurance compensation falls with age
Compensation for a leak is reduced according to the age of the pipework: typically 25–30 % once the pipework is over 30–34 years old and 50–60 % once it is over 50 years old.
Clean first, then protect permanently
Elysator works in two stages: the minerals are removed from the water, after which four chemical-free protection mechanisms keep the circuit clean. The installation needs no electricity and the system is self-regulating.
Anodic protection
Removes oxygen and stabilises the pH into a non-corrosive range, which forms a protective internal film on the surfaces.
Microbubble removal
Removes gases and oxygen, which prevents corrosion and noise problems.
Magnetic filtration
Efficiently collects magnetic particles and sludge.
Particle filtration
Filters out impurities such as sand and sealant residues.
The result: circulating water of VDI 2035 quality, with no scaling, sludge or corrosion.
The numbers that close the deal
Tampere: PUROTAP® L60 highpower · ELYSATOR® trio 15.1 · 182× Aleternum B4
| Demineralisation | PUROTAP® L60 highpower, capacity 1 200 l/h |
| Protection | ELYSATOR® trio 15.1: filtration, degassing, anode protection, magnetic sludge capture |
| Maintenance and filling | PUROTAP® Compenso 12, capacity 1 700 l, annual service |
| Low-temperature radiators | 182 x Aleternum B4 |
| Annual service | VDI 2035 maintenance contract |
From light protection to a full low-energy renovation
The same system thinking scales into four levels of scope. Choose the one the property can afford and needs now; it can be extended later.
| Element | System protection | Radiator pipework renovation | Low-energy radiator renovation | Low-energy floor / hybrid |
|---|---|---|---|---|
| Diagnostics | ✓ | ✓ | ✓ | ✓ |
| Sludge removal and demineralisation | ✓ | ✓ | ✓ | ✓ |
| Anodic protection (Elysator) | ✓ | ✓ | ✓ | ✓ |
| Composite pipework | - | ✓ | ✓ | ✓ |
| Aleternum low-energy radiators and towel rails | - | - | ✓ | ✓ (hybrid) |
| Underfloor heating | - | - | - | ✓ |
| Annual maintenance (VDI 2035) | ✓ | ✓ | ✓ | ✓ |
The energy class can rise by one step
A lower flow temperature raises the heat pump efficiency, heat recovery cuts the ventilation losses and clean circulating water prevents the performance from degrading. Together these show up in the E-value.
| Measure | Asensi system | Effect on the E-value |
|---|---|---|
| Low flow temperature → higher SCOP | Aleternum B4 composite radiators | −15 … −25 kWh/m²/a |
| Heat recovery | ARIOSA HV ventilation | −10 … −20 kWh/m²/a |
| Water quality, fouling prevented | ELYSATOR trio | prevents +8 … +15 kWh/m²/a of degradation |
The full package can raise the energy class of the building by one step, for example D → C or C → B. It is not only a certificate: a better energy class lowers the interest margin on a green loan and shows in the resale value.
Financing toolkit →Double the warranty, many times the service life
| Product | Warranty | Expected service life | Condition |
|---|---|---|---|
| Aleternum B4 composite radiator | up to 20 yrs | 40–60 yrs | VDI 2035 water quality |
| Steel radiator (comparison) | typically 10 yrs | typically replaced earlier | - |
| PEXAL composite pipe | 25 yrs | RSL 50 yrs (EPD-verified) | - |
| TRIPLUS drainage | 25 yrs | RSL 50 yrs (EPD-verified) | - |
Producing aluminium from recycled material consumes about 95 % less energy than primary aluminium.
EPBD accelerates energy renovations in Finland
A smarter pipe renovation, financing for every project
The full return on your energy decision
- VDI 2035 compliance: the network stays clean, no scaling, no sludge, no corrosion.
- Lower carbon footprint, longer service life and progress against EPBD targets.
- Better efficiency and COP on a low-temperature system, up to +15 %.
- Design engineering support included in the delivery.
- Cooling function available as part of the system.
- Low-temperature radiators, wet rooms included, warranty up to 20 years.
- Composite pipework and components delivered as one packaged solution.
- Elysator: technical water measurement, treatment, maintenance equipment and services.
- Up to 20 years system warranty when technical water quality meets VDI 2035.
- Maintenance contract available.