Used Baltur Heating & Blower for sale (13,600)

Condition: used, This listing is for the Thermo Scientific Precision CIR19 Heated Circulating Bath The unit is in full working condition and is ready for immediate use The Precision CIR‑19 is a robust and reliable lab tool tailored for high-precision temperature-sensitive workflows. Its strengths include excellent uniformity, precise digital control, safe operation features, and ease of maintenance. Whether you're incubating samples or performing delicate assays, it’s built to deliver consistent, reproducible results Overview & Applications Blodpfx Ajxhfpwjk Hsg The Precision CIR‑19 is a high-performance 19 L (5 gal) circulating water bath engineered for applications demanding strict temperature uniformity and control—think enzyme reactions, serological assays, or any sensitive method where thermal consistency matters. Key Features Perimeter-directed water flow for superior temperature uniformity. Coil-free internal design, making cleaning and maintenance a breeze. Microprocessor-based digital control, displayed via a monochrome LCD. Auto-on/auto-off timers and audible alarms, enhancing scheduling and safety. Low-fluid (dry-run) protection, guarding against overheating or damage. Hinged lid with extended height, ideal for accommodating taller labware. Supplied with a stainless steel gable cover, diffuser tray, and the quirky but useful rubber duck.

Condition: excellent (used), Year of construction: 2013, Heat exchanger / SPIRAFLO. Type - XTSD 104/64-6-304/316-C Is made in 304 and 316 steel. Bledpfx Ajhtuu Usk Hjg Year of manufacutre - 2013. Empty weight - 2.000kg. Total dimensions - Length - 700cm. Width - cirka 235cm. Height - 200cm.

Condition: used, We offer Viessmann natural gas boilers: 1. Viessmann gas boiler TYPE SX 1 Heating output 225 kW Including pump and valves 2. Viessmann gas boiler TYPE SX 1 Heating output 170 kW Including pump, valves, and piping You will receive a discount when purchasing both boilers. The boilers will be ready for operation by the end of May 2026. Bljdpfx Akoy Dpk Ho Heg

Year of construction: 1999, condition: excellent (used), working width: 620 mm, machine/vehicle number: SE 01510 A10, Heating Element Welding Machine HP60/40 by BRANSON The drive is hydraulic, supported by positioning and control systems. The machine is equipped with its own vacuum pump. Only a few operating hours (approx. 6,800 hours). Usable heating element area: width 600 mm x depth 400 mm Max. workpiece dimensions: Bjdpfoykvdlex Ak Hjlg - Max. width: 620 mm - Max. depth: 420 mm - Max. upper height: 350 mm - Max. lower height: 350 mm (Combinations of part heights possible, depending on contour) - Max. processing temperature for contact method: 400°C The modular frame design allows for easy conversion and retrofitting. The side doors and the front door in the welding area can be easily opened (for rapid retooling). The automatic safety lift door ensures a high level of operator safety. The temperature control units on the operator panel have actual/target displays. The control device is a Siemens PLC HMI. The machine is controlled by a Siemens PLC (S7-300 controller). Heating elements are equipped with temperature sensors for temperature regulation and serve as safety cut-offs in case of overheating. The pin systems in the tool mounting surfaces ensure reproducible positioning. Advantages of heating element welding technology: - Reliable welding of workpieces with low or varying wall thicknesses. - Low scrap rate due to dimensionally accurate and repeatable welds. - Precise time, temperature, and force control enable welding of sensitive parts. - Virtually all thermoplastics can be welded with this process. - Different thermoplastic types can be joined (compatibility needs to be verified). Technical data of the machine: - Power supply: 3 x 400 V AC + N + PE - Power: 25 kVA - Rated current: 20 A - Required cable cross-section: 5 cables, each 6 mm² - Required pneumatic connection: 6 bar Machine dimensions: - Machine width: approx. 1.22 m - Machine width with operator panel: approx. 1.8 m - Machine depth: approx. 2.1 m - Machine depth with operator panel: approx. 2.6 m - Machine height: approx. 2.4 m - Machine height with raised safety door: approx. 2.85 m (open door) Machine weight: approx. 2.2 t

Year of construction: 1990, condition: good (used), Throwing fan ideal for wood chips, with feed conveyor belt approximately 3 m long. Blade span 900 mm, equipped with 11 kW motor. Bledpoyy Uzcjfx Ak Hjg

Condition: ready for operation (used), ONLY THE MACHINE NO BLOCK!!! The Thermo ALPS 30 manual heat sealer effectively protects your samples from evaporation and contamination during PCR or sample storage. The ALPS30 manual heat sealer is ideal for sealing small batches of plates in low- to medium-throughput applications, and compact enough to fit conveniently on the bench without occupying excessive space. The Thermo microplate heat sealer makes it easy to protect your samples against contamination and evaporation. The Thermo ALPS 30 Heat Sealer is compatible with almost every height of microplates, blocks, and PCR plates. The ALPS30 can be used with a wide range of Thermo heat seals, such as pierceable, optically-clear and permanent seals to ensure the highest level of protection. Additionally, the Thermo microplate sealer is equipped with a built-in thermostat for precise temperature control and features an LED indicator light that signals when the device is powered on and heating. Key Features of the Thermo ALPS30 Heat Sealer: Benchtop Manual OperationBuy Used Thermo ALPS30 Heat Sealer. Adaptors Compatible with Most Heights of Microplates, Blocks, PCR Plates Compatible with Wide Ranfe of Thermo Heat Seals Pierceable Optically-Clear Bljdpfx Ajx Rhr Ask Heg Permanent Seals Prevents Contamination Prevents Evaporation Built-In Thermostat LED Indicator Light: Powered On & Heating

Condition: good (used), Heat exchanger, cooling coil, cooling pipe, cooling spiral, shell and tube heat exchanger, oil cooler -Heat exchanger: Oil cooler, shell and tube heat exchanger -Connections/Dimensions: see photos Bsdpfjyzn Dtox Ak Helg -Dimensions: 1005/1600/H110 mm -Weight: 13.5 kg

Condition: good (used), Year of construction: 2001, Wood chip heating system, feed-in with underfeed screw. Was only used during the transitional period. Heating capacity up to 550 kW. New parts such as grate, underfeed trough, and feed screw have been replaced. Dismantling has already been carried out. Location: Passau area, but on the Austrian side. Bedeyhl Dcjpfx Ak Hjlg

Condition: good (used), Year of construction: 2013, Complete heating system, but without fuel extraction from the storage room, with cyclone for flue gas dust removal, already dismantled. Bljdpfxeytra Ue Ak Heg

Condition: new, Year of construction: 2023, functionality: fully functional, cooling capacity: 311 kW (422.84 HP), type of input current: three-phase, type of cooling: air, overall weight: 3,940 kg, input voltage: 400 V, total width: 2,230 mm, total length: 6,120 mm, total height: 2,150 mm, warranty duration: 6 months, heating capacity: 327 kW (444.60 HP), Aircooled chiller/Heat pump CLIMAVENETA NX N Y/CA 1104T 311 kW/327 kW Cooling capacity: 311 kW / 88.43 tons (12/7 — 35°C) Heating capacity: 327 kW / 92.98 tons (40/45 —7°C) Year of manufacture: 2023 Options: Heat pump. Hydraulic module. Refrigerant circuit: 2 pcs. Heat exchanger: Shell and tube Condenser: Copper / Aluminum Compressors: 2 pcs. Bitzer GSU80385VLB4-2 (scroll) + 2 pcs. Bitzer GSU80295VLB4-2 (scroll) Type of refrigerant: R410А Number of fans: 8 pcs. (EC-fans) Hydraulic module: 2 pcs. water pump Grundfos MGE112MC-2FF215-JA-400 (Frequency inverter) Dimensions: 6.12x2.23x2.15 m Weight: 3940 kg Working hours: 0/0/0/0 h. Bljdpfjyzzvijx Ak Hjg Condition: New CONDITION, TESTING & READINESS The chiller / kaltwassersatz / undergoes seven stages of technical inspection and operational parameter verification. It is also tested at our own test station, with connection to water (or glycol) and adjustment of parameters according to your requirements. After testing, you will receive a detailed report with the operating performance and the overall condition of the chiller. The chiller / kaltwassersatz / is ready for transport and commissioning. Our engineers will assist you with cooling capacity calculations, selection of the appropriate cooling scheme, and configuration of the required equipment options. WARRANTY & SUPPORT The quality of the equipment is confirmed with a warranty ranging from 6 to 36 months. LOGISTICS - Worldwide delivery available - Support with loading, export documentation, and logistics coordination Get a detailed consultation. Photos, videos, and a full testing report can be provided immediately upon request.

Condition: excellent (used), Year of construction: 2016, functionality: fully functional, cooling capacity: 159 kW (216.18 HP), type of input current: three-phase, type of cooling: air, overall weight: 2,500 kg, input voltage: 400 V, total width: 1,250 mm, total length: 3,540 mm, total height: 2,200 mm, warranty duration: 6 months, heating capacity: 184 kW (250.17 HP), Aircooled chiller/Heat pump MTA TAEevo TECH 802 159 kW/184 kW Cooling capacity: 159 kW / 45.21 tons (12/7 — 35°C) Heating capacity: 184 kW / 52.32 tons (40/45 —7°C) Year of manufacture: 2016 Options: Heat pump. Hydraulic module. Refrigerant circuit: 2 pcs. Heat exchanger: Finned evaporator immersed in tank Condenser: Copper / Aluminum Compressors: 4 pcs. Copeland ZP182KQE-TFD-477 (scroll) Type of refrigerant: R410a Number of fans: 3 pcs. (Frequency inverter) Hydraulic module: 1 pcs. water pump Lowara PLM112B14S2/355-E, expansion vessel. Dimensions: 3.54x1.25x2.2 m. Weight: 2500 kg. Working hours: 8650/7460 h. Condition: Used, tested, fully operational CONDITION, TESTING & READINESS The chiller / kaltwassersatz / undergoes seven stages of technical inspection and operational parameter verification. It is also tested at our own test station, with connection to water (or glycol) and adjustment of parameters according to your requirements. After testing, you will receive a detailed report with the operating performance and the overall condition of the chiller. Bsdsyzzqtjpfx Ak Helg The chiller / kaltwassersatz / is ready for transport and commissioning. Our engineers will assist you with cooling capacity calculations, selection of the appropriate cooling scheme, and configuration of the required equipment options. WARRANTY & SUPPORT The quality of the equipment is confirmed with a warranty ranging from 6 to 36 months. Our company can also offer: - refrigerant charging; - replacement of oil and filters; - technical support. LOGISTICS - Worldwide delivery available - Support with loading, export documentation, and logistics coordination Get a detailed consultation. Photos, videos, and a full testing report can be provided immediately upon request.

Condition: excellent (used), Year of construction: 2019, 🔥 Viessmann Vitocal 200-A Air/Water Heat Pump (up to 14.7 kW) – Complete System 🔥 For sale is a high-quality Viessmann Vitocal 200-A air/water heat pump with outdoor and indoor unit. 👉 Very reliable and exceptionally quiet system – ideal for single-family homes or retrofitting ⚙️ Technical Data: • Model: Vitocal 200-A • Type: AWO-E-AC 201.A16 • Year of manufacture: 2019 • System: Split system (outdoor and indoor unit) • Output: up to 14.7 kW • COP: up to 5.1 (A7/W35) → very efficient • Max. flow temperature: up to 60 °C (also at low outdoor temperatures) • Cooling function: integrated (heating + cooling in one device) • Inverter technology: modulating operation for high efficiency ⭐ Key Advantages (from brochure): • Very quiet operation (Advanced Acoustic Design) – also ideal in residential areas • Heating and cooling in one device (reversible heat pump) • Made in Germany – high build quality • Vitotronic control with easy operation • App control via ViCare possible (Vitoconnect) • Ideal for combination with photovoltaic systems • Cascade-capable (up to 5 units) 📦 Scope of supply: • Outdoor unit • Indoor unit • Viessmann Vitotrol 200 (room control) • Viessmann Vitoconnect 100 (internet module / app control) • Pipe temperature sensor (strap-on thermostat) • Buffer tank sensor 📌 Further information: • Viewing possible by appointment • Pick-up available at short notice ✅ Excellent opportunity – complete system with accessories, available immediately 👉 New price significantly higher – top price here for a 14.7 kW system TOP HEATING SYSTEMS – Used heating systems, boilers, heat pumps & accessories directly from our warehouse We are a family-run business with around 20 years of experience in heating technology and operate a 1,500 m² warehouse in Mosonmagyaróvár, Hungary, with an inventory of approx. 50–60 units always in stock. 📍 Location: Our warehouse is located in Mosonmagyaróvár, Hungary – approx. 15 km from the Austrian border and approx. 80 km from Vienna. Mosonmagyaróvár is the first major town on the Hungarian side after the Austrian border. 🔥 Our product range includes: • Wood chip boilers • Pellet boilers • Wood gasification boilers • Log wood boilers • Biomass boilers • Oil and gas boilers • Heat pumps • Thermal ventilators • Hot air blowers • Warm air heaters • Industrial heating systems • Buffer/accumulator tanks • Heat exchangers • Screw conveyors • Discharge units • Burners • Pumps • Extensive heating accessories ⚙️ Accessories and components: In addition, we offer a large selection of accessories, including circulation pumps, plate heat exchangers, and many other components – from private applications up to industrial sizes. 🏭 Brands in our range: Fröling, Hargassner, KWB, HDG, Binder, ETA, Herz, Guntamatic, Windhager, Viessmann, Buderus, and many more. 🌐 Current offers: A majority of our current range can be found on our website: topheatingsystems.com We also have other units available which have not yet been listed online. 📅 Viewing: A viewing of our warehouse is possible by appointment. If you are interested, please contact us – we will be happy to help you find the right solution. Bodpey A Hlxofx Ak Holg

Condition: new, Year of construction: 2025, functionality: fully functional, power: 1,013 kW (1,377.30 HP), On offer, new Brand: MTU Type: 8V 4000 GS L64 FNER Year of manufacture: 2025 Power: 1013 kW Voltage: 400 V 50 Hz Operating hours: 0 With manufacturer's warranty Scope of delivery: Gen set Gas train ramp MMC control panel Blsdey Hiwljpfx Ak Heg

Condition: new, Year of construction: 2025, functionality: fully functional, power: 1,521 kW (2,067.98 HP), input voltage: 400 V, On offer: new Brand: Mtu Type: 12v 4000 gs l64 FNER Year of manufacture: 2025 Power: 1521 kW Voltage: 400V 50Hz Operating hours: 0 With manufacturer’s warranty Scope of delivery: gen set gas train ramp Bledey Hivuspfx Ak Heg MMC control panel

Condition: used, 2x KWB Powerfire TDS 300 Wood Chip Boilers – approx. 600 kW For sale are two KWB Powerfire TDS 300 wood chip boilers, which were operated together in a cascade system. 👉 Total output: approx. 600 kW — Technical Highlights: • Rotary grate combustion system – robust, self-cleaning • Cyclone combustion chamber – clean combustion, low emissions • Lambda control – optimal efficiency • Fully automatic output modulation • Automatic heat exchanger cleaning • KWB Comfort 3 control system • Suitable for both wood chips and pellets — Advantages of the Cascade System: • Flexible performance adjustment as required • Very efficient in partial load operation • Each boiler can be operated independently • Redundancy / operational reliability — Scope of Supply: ✔ Includes feed auger on both boilers (ca. 1 m screw conveyor with drive motor, mounted directly on the boiler – feeds fuel directly into the combustion chamber) ⚠️ Note: No discharge / conveying system (fuel extraction from store) → available on request at additional cost — 📍 Location: Mosonmagyaróvár, Hungary 👉 approx. 80 km from Vienna 👉 approx. 35 km from Parndorf TOP HEATING SYSTEMS – Used heating systems, boilers, heat pumps & accessories direct from stock We are a family business with around 20 years of experience in heating technology. Our 1,500 m² warehouse in Mosonmagyaróvár, Hungary, maintains a permanent stock of approx. 50–60 units. 📍 Location: Our warehouse is located in Mosonmagyaróvár, Hungary – approx. 15 km from the Austrian border and approx. 80 km from Vienna. Mosonmagyaróvár is the first major city after the Austrian-Hungarian border. 🔥 Our product range includes: • Wood chip boilers • Pellet boilers • Log gasification boilers • Log boilers • Biomass boilers • Oil and gas boilers • Heat pumps • Thermoventilators • Hot air blowers • Warm air heating units • Industrial heaters Blodoy A Ewtepfx Ak Hog • Buffer tanks • Heat exchangers • Screw conveyors • Fuel extraction systems • Burners • Pumps • A comprehensive range of heating accessories ⚙️ Accessories and Components: We also offer a broad range of accessories, including circulation pumps, plate heat exchangers, and many other components for private to industrial applications. 🏭 Brands in our portfolio: Fröling, Hargassner, KWB, HDG, Binder, ETA, Herz, Guntamatic, Windhager, Viessmann, Buderus, and many more. 🌐 Current offers: Most of our current offers can be found on our website: topheatingsystems.com We also have additional equipment in stock that is not yet listed online. 📅 Inspection: Viewing at our warehouse is possible by appointment. If interested, please contact us – we look forward to helping you find the right solution.

Condition: like new (used), Year of construction: 2019, operating hours: 10,800 h, For sale: complete containerized CHP (Combined Heat and Power) unit. Dimensions: 17x3x3.5 m (LxWxH). Equipped with MWM gas generator. Brand: MWM. Model: 2020 V20. Year of manufacture: 2019. Power output: 2000 kW. Voltage: 400 V. Operating hours: 10,800. In mint condition, ready for immediate use. Fitted with emergency cooler and exhaust heat exchanger. Bjdoy Him Tepfx Ak Holg

Condition: used, Year of construction: 2012, power: 110 kW (149.56 HP), Hargassner 110 kW – Biomass Boiler (Pellet / Wood Chip) – 2 Units Available, Cascade Operation Possible For sale is a Hargassner 110 kW fully automatic biomass boiler in a modern design (year of manufacture: 2012). ⚠️ 2 identical boilers available! ➡️ Ideal for cascade operation up to approx. 220 kW ➡️ High operational reliability and optimal performance modulation — Technical Data: • Year: 2012 Bedsy A Ei Nopfx Ak Helg • Output: 102–109 kW • Combustion output: up to 116.5 kW • Max. temperature: 95 °C • Max. pressure: 3 bar • Water volume: 190 liters • Weight: approx. 1010 kg — Key Features: • Fully automatic operation • Lambda sensor → automatic combustion control • Modulating output (demand-based adjustment) • Automatic cleaning and de-ashing • 3-pass boiler → high efficiency • Fireclay-lined combustion chamber → clean combustion • Automatic grate (self-cleaning) • Very low power consumption (~0.18 kW) • Modern, energy-efficient system — Feeding Technology / Equipment: • Incl. feed auger (standard equipment) • Currently equipped with an automatic pellet suction system (vacuum system/suction feed) ➡️ Very simple pellet operation: • Connection to pellet storage via flexible hose • System automatically draws pellets into the boiler • Fully automatic operation without manual feeding ➡️ Optional: Can also be used for wood chip operation (by connecting to a discharge system) — Condition: • Recently dismantled • Was fully operational until dismantling — Inspection: Viewings are possible by appointment at our 1,500 m² warehouse in Mosonmagyaróvár, Hungary TOP HEATING SYSTEMS – Used Heating Systems, Boilers, Heat Pumps & Accessories Direct from Stock We are a family business with around 20 years of experience in heating technology, boasting a 1,500 m² warehouse in Mosonmagyaróvár, Hungary, with a constantly available stock of approx. 50–60 units. 📍 Location: Our warehouse is located in Mosonmagyaróvár, Hungary – approx. 15 km from the Austrian border and about 80 km from Vienna. Mosonmagyaróvár is the first major city on the Hungarian side after the Austrian border. 🔥 Our inventory includes: • Wood chip boilers • Pellet boilers • Wood gasification boilers • Log wood boilers • Biomass boilers • Oil and gas boilers • Heat pumps • Thermal ventilators • Hot air blowers • Warm air heaters • Industrial heaters • Buffer tanks • Heat exchangers • Feed augers • Discharge systems • Burners • Pumps • Extensive heating accessories ⚙️ Accessories and Components: Additionally, we have a wide range of accessories, including circulation pumps, plate heat exchangers and many other components – from small-scale applications to industrial-scale solutions. 🏭 Brands in our range: Fröling, Hargassner, KWB, HDG, Binder, ETA, Herz, Guntamatic, Windhager, Viessmann, Buderus, and many more. 🌐 Current Offers: Most of our current offers can be found on our website: topheatingsystems.com In addition, we have further units that are not yet listed. 📅 Inspection: A viewing at our warehouse is possible by prior appointment. If you are interested, please contact us – we will help you find the right solution.

Condition: used, Year of construction: 2013, functionality: fully functional, machine/vehicle number: 174146, fuel type: gas, color: blue, power: 10,000 kW (13,596.20 HP), nominal power: 10,000 kW (13,596.20 HP), nominal power (apparent): 12,163 kVA, 10MW Wärtsilä AMG Gas Power Plant with Heat Recovery Bedpfx Ajygx Tzok Holg Primary Power Generation: Wärtsilä W20V34SG Gas Engine - Output: 10,000 kW (10 MW) - Configuration: 20‑cylinder, spark‑ignited gas engine - Fuel: Natural gas - Year: 2013 Electrical Generation: AMG 1120LT08 DSE Generator - Rating: 12,163 kVA - Year: 2013 Heat Recovery System: Cochran Waste Heat Boiler - Thermal Output: 17,500 kW - Year: 2013 Cochran Economiser – Waste Heat Recovery Unit - Thermal Output: 2,719 kW - Year: 2013

Condition: reconditioned (used), functionality: fully functional, operating pressure: 150 bar, high-pressure hose length: 10,000 mm, input voltage: 400 V, fuel: electricity, overall weight: 135 kg, warranty duration: 6 months, temperature: 80 °C, HOT WATER PRESSURE WASHER NILFISK 5M-150/750 NEW ELECTRIC HEATER (2x) The device has new equipment, including a German brand R+M gun, stainless steel lance, steel braided hose and 25° power nozzle A durable brass head with new ceramic pistons and seals guarantee long and trouble-free operation A very efficient three-phase motor ensures stable operation even with long-term use Thanks to the operating parameters of 150bar and 750l/h, the machine can be effectively used for heavy work in construction, logistics and agriculture Fully electric water heating allows work in places where exhaust gas production is not allowed. Each device we offer has individually taken photos, you buy exactly the machine you see TECHNICAL DATA: Power supply voltage [V]: 400 ~3 phases Pressing capacity [l/h]: 750 Working pressure [bar]: 150 Max. heating temperature [°C]: 80 Heater power [kW]: 24 Cleaning agent tank [l]: 10 + 10 Hose length [m]: 10 Weight [kg]: 135 EQUIPMENT: NEW ELECTRIC HEATER (2x) NEW durable pressure gun by German brand R+M NEW pressure lance made of stainless steel Bjdev Src Nopfx Ak Helg NEW reinforced pressure hose in steel braid 10m NEW power nozzle 25° WATER FILTER AND GEKA claw connectors - FREE KEY FEATURES: Open oil system - no operating time limit Built-in chemical tank allows dosing of cleaning fluid directly through the machine Very legible and intuitive control panel Simple construction and good access to individual elements under the housing make the machine user-friendly and easy to service

Condition: good (used), Year of construction: 1994, Heating system for hot water or steam Heating capacity: 6 MW Fuel: wood chips With oil burner as backup heating Bljdpfx Ajyizqnjk Heg Dismantling must be carried out by the buyer

Condition: good (used), Year of construction: 2000, power: 200 kW (271.92 HP), Heat exchanger from hot water to air, ideal for drying. Size approx. 3 m x 1.5 m. Estimated thermal output 200 - 300 kW, possibly more. One fan is missing. Blsdpfoy D E Rpex Ak Heg

Condition: good (used), Year of construction: 2010, functioning wood gasification plant with 40 kw electric power and 80 kw heat output Bledjiggpbjpfx Ak Heg

Condition: new, Year of construction: 2023, Due to a planning error, I am selling a new, originally packed cantilever discharge system for a Fröhling heating system for 6 m room size with 1 m auger extension Bljdpfx Aouq Iy Rjk Hog with separate drive for screw and turntable as 2 motors, ideal for 2 boilers Photo is from another system as mine is still packed

Condition: good (used), Year of construction: 2014, functionality: fully functional, still well-preserved wood chip heating system Bedpfx Akjw Rpdrj Hjlg 60 kW heating capacity year of manufacture 2014 without discharge unit (can be provided if needed)

Condition: used, Year of construction: 2008, Wood chip heating system with 100 kW heating output. Feed screw (as seen from the front) on the left. Ash container on the right. With discharge system for a room diameter of 6 m. Already dismantled. Becoming available due to connection to district heating. Loading onto truck included. Bedpfxsyalbls Ak Helg