Using Heat Pumps for Underfloor Heating

Date: Sep 11, 2018 - 1:10 pm

Underfloor heating or radiant in-floor heating is increasing in popularity among Kiwi households due to its many advantages. Not only are heated floors lovely to walk on, but they are also economical, comfortable and energy efficient to run.

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Unlike other heating methods, radiant underfloor heating encourages heat to rise up through a space via convection, rather than forcing it down. In-floor heating can either take the form of hydronic heating or electric resistance heating. We’ll focus on the first one.

Hydronic heating involves laying a network of pipes onto the subfloor and circulating a heating fluid through the piping. The heated fluid radiates heat into your floors, warming your home evenly and comfortably. Hydronic heating operates silently, which is another plus.

The fluid can be heated in various ways: by using a heat pump, using fossil fuels or electricity by means of a boiler heating unit. Heat pumps generate hot water at around 40oC, which is ideal for heated floors. On the other hand, gas and oil boilers heat water to 65-85oC, which will scald your feet. Using these systems will require mixing hot and cold water to bring the temperature down to a comfortable level, which is highly inefficient.

Air-to-water heat pumps take the heat from ambient/outside air and transfer the heat into the water via a heat exchanger in the cylinder. Some heat pump systems can be configured to provide part of the energy needed for domestic water heating.

With the integration of a heat pump, your underfloor heating system will have the potential for zoned control. This means that rooms can be heated on an on-demand basis, helping you to cut down your energy consumption. In addition, heat pumps offer the versatility of switching between heating and cooling modes for year-round comfort.

Heat pumps generally use less energy to maintain the heat when the target temperature is reached. Some units can control the temperature as accurately as 0.5oC. When there is a big difference between the desired temperature and the actual temperature, some heat pumps automatically adjust to a higher frequency to increase the temperature rapidly.

Modern heat pump technology also has a smart-defrost feature that allows faster recovery by reducing defrosting time and extending heating time. This further enhances heating efficiency. And since they are designed to work well into the winter season, heat pumps typically have inbuilt anti-freeze protection along with other protection controls, such as water flow switch protection, compressor overload protection, high/low pressure protection.

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In summary, underfloor heating powered by a heat pump is a convenient and efficient way to heat your home.

Installation

Underfloor heating is often integrated in the design of a new home build for practical reasons. It is easier to lay the pipes before the floors are laid than to retrofit them.

In existing homes, casting the pipes is a lot trickier as there are items of furniture and fittings in the way and some floors can be difficult to work with. For elevated homes, the pipes can be retrofitted via “diffusers” spread below your timber floor. For concrete slab floors, the pipe is attached to a mesh profile and topped with a concrete screed that may be tiled or carpeted.

As you can imagine, a more complex installation means higher upfront costs. But if you think about the comfort and long-term energy savings, a heat pump-powered underfloor heating system can be worth the investment.

For more information or inquiries, please contact us on 0800 443 284.

Preslab Underfloor Heating System Installation

Date: Sep 15, 2017 - 1:33 am

We just finished a preslab underfloor heating system installation for a home in Silverdale, Auckland. The is a new home being built, the perfect time to get underfloor heating installed.

Our specialist laid underfloor heating pipe on top of mesh and used wire tie downs to keep the pipe in place.
The system consists of 2x circuits of pipe:
Circuit 1 approx 85 meters
Circuit 2 approx 100 meters

Correct spacing of the pipe  is critical to avoid cold spots and even heat distribution. This is critical for a quality heating system. As you can see in this install, the pipe covers the whole floor very evenly and will ensure there is consistent heating all throughout the house. In general areas such as bedrooms for the lounge the pipe is laid at 200mm centers. Smaller areas such as bathrooms and kitchen are laid at 100-150mm centers. This enables maximum heat output in smaller areas whilst larger areas can be comfortably maintained.

Once the pipes were laid and the manifold and valves installed, the system was pressure tested with water to ensure there are no leaks and that it will operate correctly. It rated at 1000kpa.

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Are you interested in an underfloor heating system? Underfloor heating is an excellent solution to efficient home central heating. Advantages include the fact that it is completely hidden (no radiators or vents to see), extremely efficient, provides even heating and can be designed specifically for your needs. If you are building a new home or renovating, speak to us about an underfloor heating system now!

Oxygen barrier pipe can protect your central heating

Date: Mar 14, 2016 - 1:29 am

An oxygen barrier pipe in short protects your water heater from rusting also any other system components such as valves etc. Corrosion can happen and cause damage in as little as one to two years unprotected. The oxygen barrier pipe prevents oxygen from penetrating the material of the central heater system thus reducing greatly the risk of damage and rust. The pipe is either a cross linked polyethylene or polybutylene.Rehau-oxygen-barrier

The rifeing oxygen barrier pex tubing comes in sizes from 3/8″ to 1″ and works with crimp, clamp, compression pex press and sharkbite press connections. It’s maximum temperature is of 180’f up to a pressure of 100psi or up to a pressure of 160psi at 73’f.

Pex A grade tubing is the highest grade available and can be used in closed loop hydronic heating systems. It comes in sizes from 5/16′ to 4′ and has a thermal memory so you can repair any kinks in the pipe by heating it and it will return to its original form. It is also freeze resistant. It works with all types of pex connectors up to 1″. But only proper expansion fittings and shark bite fittings work with connections from 1 1/4″ to 2″. It has a maximum temperature of 200’f up to a pressure of 80psi or 160psi at 73’f.

So if you want to protect your water heater from damage and rust thus saving you time and money and also frustration give us a call and we can wrap it up. We only use superior products so they can be fully relied on. We are fully licensed and guarantee our work so not only can you trust our materials but you can trust us to do a good job. Our certified installers are fully trained to offer expert advice on the job. Once your happy, we are happy.

 

Heat Pump Underfloor Heating Systems

Date: Jul 28, 2015 - 11:23 pm

One type of underfloor heating system you can use when putting together a central heating system is the heat pump underfloor heating system. Why is this system the one to go for?

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Heat pump underfloor heating systems are extremely efficient systems. The reason for this is that heat pump use electricity to move heat, not make it, which makes them much for efficient than other systems such as gas or solar. Heat pumps are a low temperature heat source which makes them perfect for an underfloor heating system because underfloor heating systems run a low temperatures. Heat pump systems are very versatile, they can work anywhere, unlike solar systems which require a certain amount of sunlight to warm the water. They can be incorporated in almost any underfloor heating system, allowing them to be used in all home and buildings where an underfloor heating system is required.

Talk to us today if you are interested in a heat pump underfloor heating system for your home.

 

laing underfloor heating systems (German made)

Date: Jun 19, 2015 - 2:45 am

laing_underfloor_heating_systemsBrilliant German made system introduced into New Zealand about 10-15 years ago. Very compact and can easily supply efficient heat to smaller  and midsize floor areas. Laos ideal with for combination systems where low temperature and high temperature systems need to be combined. For example radiators and underfloor heating. Laing is a unique and one of kind system that allows you to create indirect systems at unbeatable prices. The image above represents a n UFH system we serviced this week. Part of the inspection is to ensure all valves, circuits, electrical and expansion tank are working correctly and safely.

Central Heating in NZ  offer affordable repair and servicing services for any size Laing underfloor heating systems. If your system needs a repair or maintenance give us a ring and speak to the pros!

Underfloor Heating Manifold Specification

Date: May 26, 2015 - 9:32 pm

underfloor_heating_manifoldPossible situations:
This is for low temperature water that has no circulation pump for the underfloor heating requirement, i.e. no circulation pump in heat source.

 

Situations:

  • Low temperature buffer tank – Controlled at Max temp of 45˚C
  • Temperature controlled ring main –

Includes:

  • Manifold
  • End set with pressure gauge 0-4 bar,3/8″ Auto air, ½” draining/filling valve
  • Ball valve set with thermometer 0-60°C
  • G1” Elbow
  • WILO 15/6 (6 Meter head) pump
  • Electrical wiring & switch
  • Underfloor to pipe manifold compression connector
  • Assembled in powder coated Radiant Heating Cabinet

underfloor_heating_manifold_without_pump Possible situations:
This is for low temperature water that has the circulation pump incorporated in the heat source. Situations, all containing circulation pump as a standard option:

 

 

  • Gas boiler system – Controlled at Max temp of 45˚C
  • Diesel boiler system – Controlled at Max temp of 45˚C
  • Heat pump system – Controlled at Max temp of 45˚C
  • Remote pump off primary header

Includes:

  • Manifold
  • End set with pressure gauge 0-4 bar,3/8” Auto air, ½” draining/filling valve
  • Ball valve set with thermometer 0-60°C
  • G1” Elbow
  • Underfloor to pipe manifold compression connector
  • Assembled in powder coated Radiant Heating Cabinet.underfloor_heating_manifold_3way_bledning_control

    Possible situations: The principal is that the circulation pump satisfies the underfloor heating flow. Ideal were individual electric zone control is used.

    The flow and return mains only need satisfy the heat source to the control panel and not the full flow of the underfloor water resulting in smaller diameter mains.
    The heat source circulation only needs to be sized to circulate to the manifold and back, not through the underfloor heating pipework.

    Situations:

  • Heat Pump – Controlled at Max temp of 60˚C
  • Condensing Gas Boiler – Controlled at Max temp of 60˚C

Includes:

  • Manifold
  • End set with pressure gauge 0-4 bar,3/8″ Auto air,
  • ½” draining/filling valve
  • Ball valve set 1″
  • Constant Supply Temperature Manifold Set Temp of 45˚C
  • WILO RS 25/6 (6 meter head) pump
  • Underfloor to pipe manifold compression connector
  • Assembled in powder coated Radiant Heating Cabinet

Central Heating NZ  have various underfloor heating manifold solutions and can accommodate any underfloor heating design. Our services include maintenance, repair, design and installation of underfloor heating systems. Please call 0800 443 284 for more information or an obligation free quote

Underfloor Heating for retirement home

Date: Jan 5, 2015 - 12:39 am

new_underfloor_heatingAnother successful Underfloor Heating installation North of Auckland.

This retirement home will be running
two 32 KW Tahiti natural gas boilers to power over 3200 meters of underslab underfloor heating! Five manifolds will manage over 15 zones with individual temperature control ensuring maximum efficiency and reliable heat  for the elderly. What are the benefits of underfloor hydronic heating to conventional air powered heatpumps? Please follow THIS LINK for more information. Central Heating NZ  specialise in European style underfloor central heating. If your building a new home it makes sense to get the pipe into that concrete at a rate of less than $40/meter! Cash-flow dependent you can complete the system installation immediately or a few years down the track. Call us on 0800 443 284 for more information or send us an email on quote!central-heating.co.nz