Flow rates, pressure drops, tubing length, location of manifolds all supplied by Kroll’s Hydronic CAD Design team. This is a no cost turnkey service. Over twenty years of practice helps Installers and Builders & Owners to cooperate and complete projects. It’s all part of the in-house Kroll Hydronic design process. Kroll uses LoopCAD by Avenir and CSIRO Heat Load calculation software. Kroll produces detailed piping schematics produced using TACO Flopro Designer and TACO HVAC System Solution software as well as electrical schematics, along with the bill of materials, or BOM, at no cost to the client. The BOM in excel format is very handy for budget calculation as it itemises every component. Material, labour and equipment costs can be inserted. It’s part of the hydronic CAD design process. Kroll is a 20 year member of AIRAH, the Australian Institute of Refrigeration, Air Conditioning & Heating.
Kroll offers a free tailored room by room heat-loss [or heat load] calculation, sizing, CSIRO heat load software and Avenir’s LoopCAD and Taco FloPro system layouts specifying full colour pipe dimensions and power ratings required to achieve a comfortable heat level on the coldest days of the year. Slab heating and/or panel radiators can be implemented. Itemised Bill of Material (BOM) is standard, see Material List example below. The BOM is in Excel or .xls format for simple budget calculation. The hydronic design specifies equipment for the installing plumber and electrician, even down to hydraulic flow rates in LPM or litres per minute, the water velocities in the circuits, delta T across the loads as well as head loss or pressure drops across all components. Note that Kroll is a 20 year user of TACO design software, using TACO HVAC Solution as well as TACO FloPro Designer.
FloPro Layout
Materials List
Heat Source
Kroll offers hydronic heat sources powered by wood, wood pellets and waste oil or dieseline in power ratings from 20kW up to 250kW
Heating Zones
Kroll can design one or more heat zones independently controlled by the zone’s own WIFI Smart thermostats
Hydronic wood fired boilers are back in demand, and finding the right one for your home or office that suits your needs can be a bit tricky. Hydronic boilers have low maintenance costs and are slightly cheaper. If you want to buy a wood hydronic boiler, Kroll Heaters offer a wide range of sizes and types. The Ventum or VG40 40kW boiler is over 91% efficient. The VG30 30kW boiler is also available.The Caria Pellet boilers are certified over 93% efficient. Caria is available in 23kW and 40kW up to 100kW. The Ventum boilers require thermal storage tanks to be the heat bank or hot water storage for your home. It is best to have 50 litres of storage per kW of load. EG: a 20kW load needs 1000l of thermal storage, a 40kW load needs 2000l of thermal storage.
Thermal Storage
Thermal storage is an important component of modern wood boiler systems. By absorbing extra heat generated during the burn cycle, heat storage allows wood boilers to operate with less tending, lower emissions and higher efficiency. Heavy tank insulation holds stored heat, allowing for 24 hours or more between burn cycles. Wood boilers used properly with heat storage will form no harmful firebox condensate and will outlast boilers used without thermal storage. Heat storage is a condition of some wood boiler warranties and EPA approvals.
Using properly sized heat storage with wood log and wood pellet boilers can reduce on/off cycling by half or more. Reducing cycling dramatically decreases emissions and the need for boiler service, while improving heating response time. This means less ash creation and a higher degree of building occupant comfort.
Continuous Burning or Batch Burning
Because wood burns best when burned continuously, but most buildings cannot take the full output of the boiler, insulated water tanks are used as thermal storage for excess heat. The heat stored in the water can be used for many hours after the fire has burned out. Most of our customers report visiting their boilers no more than once every 12 hours in the coldest weather. When the weather gets warmer, visits to the boiler become less common. If just a little heat is needed, the heat in the storage tanks often will last 2 days or more. A special charging valve called he LK Armature 810 is used to fill the tank from top to bottom with 80C water.
It’s important to determine how much floor space you intend to cover. Most wood boilers work well for a standard-sized home with three bedrooms. If you have different requirements, you might need to opt for a custom-made boiler. Kroll supplies state-of-the-art Ventum, or VG Series boilers to meet all types of requirements, whether industrial or personal. Ask about the Caria for wood pellet heating.
Safety:
Although wood boilers generally provide more safety compared to other boilers, they can still pose serious health hazards, especially for homes with kids and pets. Pay close attention to the safety provisions of a wood boiler. Consult the manufacturer to learn best practices for using them. The Ventum is RCM electrical safety compliant.
Efficiency:
Wood hydronic boilers in Australia are not particularly known for their fuel efficiency, however, right now, the Ventum or VG boilers are over 90% efficient and certified to European Standard EN303-5, Class 5. Wood can be expensive and hard to procure and store, so the efficiency of wood-fueled boilers is crucial to avoid becoming a part-time lumberjack! Kroll offers a range of accessories that you can attach to our hydronic boilers to customize them fully.
Although hydronic boilers don’t require additional accessories like steam boilers (which need a pump to function), you might still want to consider any additional accessories you may need based on your requirements. It’s important that the boiler you buy can function with the accessory you plan to use. Buffer tanks are a great option to increase efficiency. Ecomax provides remote control.
Legal compliance:
Some countries have enacted comprehensive laws to regulate all types of boilers, including steam and hydronic boilers. If you are getting a custom-made boiler for your place, be sure to check the relevant laws governing boilers, if any.
We have outlined the key factors that make a perfect wood hydronic boiler. At Kroll, we pay close attention to detail and invest significant time and money in all our boiler designs to ensure you receive a product that is 100% customized to your requirements.
Hydronic wood fired boilers are back in the trend, and finding the right one for your home or office that suits your needs can be a bit tricky. Hydronic boilers have low maintenance costs and are slightly cheaper. If you want to buy a wood hydronic boiler, Kroll Heaters offer a wide range of sizes and types. The Ventum or VG boilers are over 90% efficient. We have created a guide on how to find the best wood hydronic boiler:
It’s important to determine how much floor space you intend to cover. Most wood boilers work well for a standard-sized home with three bedrooms. If you have different requirements, you might need to opt for a custom-made boiler. Kroll supplies state-of-the-art Ventum, or VGSeries boilers to meet all types of requirements, whether industrial or personal.
Safety:
Although wood boilers generally provide more safety compared to other boilers, they can still pose serious health hazards, especially for homes with kids and pets. Pay close attention to the safety provisions of a wood boiler. Consult the manufacturer to learn best practices for using them. The Ventum is RCM electrical safety compliant.
Efficiency:
Wood hydronic boilers in Australia are not particularly known for their fuel efficiency, until nowThe Ventum or VG boilers are over 90% efficient and compliant to EN303-5. Wood can be expensive and hard to procure and store, so the efficiency of wood-fueled boilers is crucial to avoid becoming a part-time lumberjack! Kroll offers a range of accessories that you can attach to our hydronic boilers to customize them fully.
Accessories:
Although hydronic boilers don’t require additional accessories like steam boilers (which need a pump to function), you might still want to consider any additional accessories you may need based on your requirements. It’s important that the boiler you buy can function with the accessory you plan to use. Buffer tanks are a great option to increase efficiency. Ecomax provides remote control.
Legal compliance:
Some countries have enacted comprehensive laws to regulate all types of boilers, including steam and hydronic boilers. If you are getting a custom-made boiler for your place, be sure to check the relevant laws governing boilers, if any.
We have outlined the key factors that make a perfect wood hydronic boiler. At Kroll, we pay close attention to detail and invest significant time and money in all our boiler designs to ensure you receive a product that is 100% customized to your requirements.
The Caria series pellet boilers are controlled by an Ecomax24, this controller tracks and monitors the operations of the boiler. The controller also uploads these metrics to the econet24 website and application where you are able track past activity, see current operation of the boiler system, set burn schedules and many other settings A Caria series 23kW pellet boiler has now been installed and secondly commissioned at Maldon in country Victoria. Heating calculations indicate 23kW is required. A 300 litre Buffer Tank is being installed, charged by an LK810 charging valve by LK Armatur the Swedish hydronic specialist and long time partner to Kroll Heaters. https://www.lkarmatur.com/en/ Circulation to the radiators is with the latest DAB EVOPLUS LITE 120/180 25. https://kroll-heaters.com.au/wp-content/uploads/2026/08/50240034_EVOPLUS-LITE_CL_ENG_DOC_web_Copy_2-scaled.jpg
Commissioning Complete August 2026
Although there were some minor leaks, the team installed the Caria CP23 without major hassles. Subsequently the technician programmed the buffer tank to fill the 300l thermal storage tank top to bottom with hot water at 82’C accordingly following the Caria user guide. Accordingly the owner will start the boiler remotely using the Econet24 smartphone application. The owner’s house thermostat will enable the DAB pump to send water to the house radiator network. Additionally, the owner reports that afterwords the home heated up quickly once they heated the tank as a result of the commissioning. In conclusion the owner now has a warm home able to be remotely warmed prior to visiting.
Kroll promotes heating solutions using free waste. If you have access to free wood or free waste oil this is by far the cheapest and most energy-efficient way to heat a house in Australia.
Solutions
The Ventum or VG Series gasifies wood logs for efficient heat.
The Caria Series utilizes wood pellet boilers see below.
Caria Pellet Boiler
EMB Waste Oil Burners
The German made EMB burners coupled to the ACK2 Water Heater provides heat from waste oil.
Kroll uses LoopCAD for slab heating design, see below for piping layout showing connection to manifolds. Kroll also supplies recommended flow rate for each circuit as well as a comprehensive heat loss calculation based on your space’s construction
Our European made Kozy heats workshops and spaces in any size area up to 300m2 or more and uses 3 litres of waste oil per hour on low and 5 litres per hour on high. Your Kozy includes its own powerful blower fan. This means it effectively heats spaces and takes the chill off the air throughout your building. You don’t need to huddle around the heater to get warm, and you don’t have to position it centrally.
You can place it tucked away in the corner or against a wall. See the ‘Kozy’ video below:
Long Life
You can expect your Kozy to have a long trouble-free life. The first Kozys installed back in 1982 are still going strong. Compared to other types of heaters, your Kroll Kozy will pay for itself in just one or two winters. Once you’ve got one, you’ll be happy!
Installation is Easy
The operator’s manual explains the simple guidelines for erecting the stainless steel flue. A ‘T’ piece with embedded regulator is supplied. You can find the T piece at the lower end of the flue locally ‘off the shelf’, or we are happy to supply everything you need. It typically consists of about 5 metres of flue, with a hat on top.
Maintenance
The Kozy is not “high tech”. To start it, you pour a cup of kero or diesel into the cast iron pan at the bottom of the Kozy, light a scrunched-up A4 paper sheet into a ball, light it, and drop it onto the pan. After about ten minutes, an internal thermostat automatically starts the oil pump and the blower fan. The system trickles waste oil into the hot pan, where it vapourises into a gas and burns very cleanly. When you burn waste oil in a Kroll, you see no smoke or fumes. The emissions remain very clean and have been tested by an EPA approved company, well within EPA requirements. The contaminants in waste oil, such as carbon, dirt, and detergents, break down in the 750o C temperature of the furnace, to a dry crusty ash, which accumulates in the cast iron pan and needs removal each day.
Your Kozy includes two pans. At start-up, use the clean one. At a convenient time, clean yesterday’s pan, ready for tomorrow’s use. The amount of ash you get depends on the nature of the oil; for example, very thick black oil from old diesel engines leaves more ash, while transmission oils leave almost none. A bit of water in the oil doesn’t worry your Kozy at all. Most commonly, oil from petrol engine vehicles or a combination of waste oils generates lots of heat and minimal ash. You’ll spend about ten minutes a day looking after your Kroll Kozy.
Wouldn’t you agree, it’s a small inconvenience to pay for the advantage of heating with free fuel?
Heating with waste oil or used oils can be an extremely smart choice for space heating and/or floor heating in domestic and commercial applications. If your farm or workplace produces used oil why not get your heat for minimal cost. The waste oil can be used to heat up water or hydronic applications, or air heating using the SZ furnace or the Kroll Kozy.
Your Waste Oil Heaters and Heating Solution
Waste oil heating and waste oil burning is Kroll core business.
This means the precision burning of waste oils, used or unused automotive or vegetable oils for domestic or commercial heating. Space heating with waste oil heaters and hydronic heating from recycled waste & used oils is what we do for you. Commercial heating, home heating and hydronic design services are available. Recently wood gasification hydronic boilers have been available as well. So, waste oil and waste wood!
Kroll can provide the hydronic solution for your floor heating or hydronic radiator heating or a combination of the two.
Kroll fan coil units convert hot water into warm air similar to a how car radiator uses a fan to coil the engine water. We use the German made EMB burners to burn the oil. These are available in 20 kW power output up to 250 kW if required.
The powerplant is the German made EMB series burners, available from 20 kW to 250 kW
The German made EMB Series waste oil burner provides a broad range of power outputs.
The operation sequence pumps fuel out of the special Kroll day tank and into the burner tank. A float switch controls the level inside the burner tank and supplies power to an oil pump on the day tank. Another float switch (overflow protection) serves as a limiter, which switches to fault if the tank is overfilled.
The operation sequence pumps fuel out of the special Kroll day tank and into the burner tank. A float switch controls the level inside the burner tank and supplies power to an oil pump on the day tank. Another float switch (overflow protection) serves as a limiter, which switches to fault if the tank is overfilled.
A thermostat sets the oil temperature in the burner pre-heater tank and starts the burner when the set point temperature is reached.
Also, the automatic burner control system monitors the operation of the burner and provides diagnostics to the user. A special nozzle aspirates and finely atomises the fuel using the compressed air flowing into the nozzle[s]. Therefore, the compressed air serves as primary air for the combustion process.
The burner blower supplies the secondary air, which mixes with the atomised spray at the baffle plate. This ensures full combustion and operational reliability.
Also, at an oil temperature in excess of 150° C, the safety switch automatically de-energises the burner. The Siemens controller displays diagnostics. These burners mount to air furnaces like the Kroll SZ series or heat water in a hydronic boiler [water heater]. Talk to Kroll about your heating needs and hydronic design for domestic and industrial applications. Off grid users take note!
The operation sequence pumps fuel out of the special Kroll day tank and into the burner tank. A float switch controls the level inside the burner tank and supplies power to an oil pump on the day tank. Another float switch (overflow protection) serves as a limiter, which switches to fault if someone overfills the tank.
A thermostat sets the oil temperature in the burner pre-heater tank and starts the burner when the set point temperature is reached.
Also, the automatic burner control system monitors the operation of the burner and provides diagnostics to the user. A special nozzle aspirates and finely atomises the fuel using the compressed air flowing into the nozzles. Therefore, the compressed air serves as primary air for the combustion process.
The burner blower supplies the secondary air, which mixes with the atomised spray at the baffle plate. This ensures full combustion and operational reliability.
Also, at an oil temperature in excess of 150° C, the safety switch automatically de-energises the burner. The Siemens controller displays diagnostics. These burners mount to air furnaces like the Kroll SZ series or heat water in a hydronic boiler [water heater]. Kroll can help with your heating needs and hydronic design for domestic and industrial applications. Off grid users take note!
Hydronic wood fired boilers are back in the trend, and finding the right one for your home or office that suits your needs can be a bit tricky. Homeowners and office managers favor hydronic boilers over steam boilers due to their ease of use and lower risks of accidents and injuries. Unlike steam boilers, hydronic boilers have low maintenance costs and are slightly cheaper. If you want to buy a wood hydronic boiler, Australian manufacturers and suppliers offer a wide range of sizes and types. We have created a guide on how to find the best wood hydronic boiler:
It’s important to determine how much floor space you intend to cover. Most wood boilers work well for a standard-sized home with three bedrooms. If you have different requirements, you might need to opt for a custom-made boiler. Kroll builds state-of-the-art boilers to meet all types of requirements, whether industrial or personal.
Safety:
Although wood boilers generally provide more safety compared to other boilers, they can still pose serious health hazards, especially for homes with kids and pets. Pay close attention to the safety provisions of a wood boiler. Consult the manufacturer to learn best practices for using them.
Fuel-efficiency:
Wood hydronic boilers in Australia are not particularly known for their fuel efficiency, but you should still make efforts to find models that are fuel-efficient. Wood can be expensive and hard to procure and store, so the efficiency of wood-fueled boilers is crucial to avoid becoming a part-time lumberjack! Kroll offers a range of accessories that you can attach to our hydronic boilers to customize them fully.
Accessories:
Although hydronic boilers don’t require additional accessories like steam boilers (which need a pump to function), you might still want to consider any additional accessories you may need based on your requirements. It’s important that the boiler you buy can function with the accessory you plan to use.
Legal compliance:
Some countries have enacted comprehensive laws to regulate all types of boilers, including steam and hydronic boilers. If you are getting a custom-made boiler for your place, be sure to check the relevant laws governing boilers, if any.
We have outlined the key factors that make a perfect wood hydronic boiler. At Kroll, we pay close attention to detail and invest significant time and money in all our boiler designs to ensure you receive a product that is 100% customized to your requirements.
The German made EMB Series waste oil burner provides a broad range of power outputs.
The operation sequence pumps fuel out of the special Kroll day tank and into the burner tank. A float switch controls the level inside the burner tank and supplies power to an oil pump on the day tank. Another float switch (overflow protection) serves as a limiter, which switches to fault if the tank is overfilled.
A thermostat sets the oil temperature in the burner pre-heater tank and starts the burner when the set point temperature is reached.
Also, the automatic burner control system monitors the operation of the burner and provides diagnostics to the user. A special nozzle aspirates and finely atomises the fuel using the compressed air flowing into the nozzle[s]. Therefore, the compressed air serves as primary air for the combustion process.
The burner blower supplies the secondary air, which mixes with the atomised spray at the baffle plate. This ensures full combustion and operational reliability.
Also, at an oil temperature in excess of 150° C, the safety switch automatically de-energises the burner. The Siemens controller displays diagnostics. These burners mount to air furnaces like the Kroll SZ series or heat water in a hydronic boiler [water heater]. Talk to Kroll about your heating needs and hydronic design for domestic and industrial applications. Off grid users take note!
Heat Loss Calculations designed by the CSIRO
Heat Loss Calculations designed by the CSIRO
the Ventum or VG boilers are over 90% efficient and certified to European Standard EN303-5, Class 5. Wood can be expensive and hard to procure and store, so the efficiency of wood-fueled boilers is crucial to avoid becoming a part-time lumberjack! Kroll offers a range of accessories that you can attach to our hydronic boilers to customize them fully.
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