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Installing
 a HeatBack


Who can install a HeatBack? 
Experienced installers such as plumbers. An installation guide is provided with each order.

How much does it cost to install? 
HeatBack installation requires an experienced plumber. The installation of one HeatBack should take between one hour and one working day depending on the new or retrofit situation. 

What do I do to install a HB?
1) For new-buildings: Contact your architect, builder or installer and/or us.
2) For retrofitting: contact us via email or our order form and/or provide feedback to us

Do I need to replace any other bathroom or rinsing fixtures? 
No. Heatback is designed to be a stand alone solution. 

Is installation messy?
Depends on type of construction. Residual dust may be unavoidable when retrofitting.

Where can I install the HB? 
HB is designed for intersecting a waste pipe discharging from the (any) hot water supply system, primarily in showers, basins and other ‘use and spill’ rinsing fixtures, but ideally where the use is most intense.  It may be installed in substantially horizontal sanitation run off pipes anywhere in in-floor or under-floor cavities or near gully traps. It will only take up 150mm of line fall in the discharge pipe. Some water supply characteristics may be corrosive to copper. Please clarify this question with the authority in your area. Dimensions of the space required for a HeatBack for inserting or connecting to a waste pipe are approximately 30 x 30 x height=25cm.
Allow extra for the shower basin waste trap. 

I have a shallow floor in my bathroom. How deep does the cavity need to be? 
You only need a depth of up to 340 cm (including a regular waste trap) underfloor or in-floor to install a HeatBack. The level of the outlet of a standard discharge trap usually dictates the overall depth required. If insufficient space is available between floor and ceiling, consider to use a shallower trap or divert the waste pipe to e.g. wardrobes below.

Can HB be installed in a concrete slab? 
Yes, for new slabs the HB unit is installed together with all other underfloor services. Refer to the 'Stood' paragraph on page 12 of the InstallGuide.
Prior to the pour once the reinforcing mesh is placed and the exact FF level is known, a 150mm PVC (cut to suit) covered shaft is placed on the HB unit for floor penetration. It is held in central position by placing it on four  moulded provisions in the HB Top. The shaft is then independently secured to the reinforcing steel by wire ties. Refer detail in the InstallGuide. Secure the shaft to the reinforcing steel, not the HB unit, avoiding dislodging during concrete pour. Note that you could also have an opening in the floor with a manhole, as some TAs won't allow services under concrete.

Can HB be installed in or from a framed floor?

Yes. HB will fit between long span floor joists or beams. The height is 225mm. 
Unless you intend to replace the waste trap with a lower profile one, 340 mm of height may be required to completely enclose the HB above the lower level ceiling line. Refer detail on page 8 to 12 of the InstallGuide.

Can HB be installed under a suspended floor? 
Yes, provided there is access for maintenance, using 5mm threaded suspension rods from eye lag screws, or from an optional purpose designed bracket. Refer detail on page 8 to 12 of the InstallGuide.

If there is no access for maintenance under the floor, can HB be installed regardless? 
Yes. Refer details on our website heatback.co.nz. HB may be installed with in-floor service access or hatch. If not practical, this requires a mandatory life expectancy of 50 years type installation.   An optional floor penetration solution for internal access is recommended.  HB may also be remotely monitored for temperature, fouling and reverse flushing. Enquire to your installer.

How long would it take to install? 
New dwellings: Installation under repeated Approved Method solutions are expected to take hours rather than days.  Retrofit: This largely depends on your existing services situation and type of construction of your house. For both options, HeatBack units may be pre-assembled in the factory or workshop to suit the installation in focus and options include rapid on-site connection fittings.

Can a single module HB be connected to more than one waste outlet? 
Yes. Although HB models are made available for intersecting one waste pipe, the wastewater in that pipe may be sourced from a basin and one or more shower combined. Even if used simultaneously, the HB will process the wastewater efficiently. One HB can process up to five simultaneous discharges from HW fixtures provided certain configuration guidelines are followed.

What are the do’s and don’ts? 
DO ask your supplier, who will help you ensure that: the work is done by an experienced installer - remember code compliance is the responsibility of the installer and that Safety & Health guidelines for work on sanitation systems are to be observed.  DO ensure that the composition of the potable water in your area is not excessively corrosive to copper. Your Installer may be able to help you with an indirect heat recovery system.  DO Please complete the installation following the details in the Installation Guide and ensure: 

  • The installation complies with the Statutory Requirements, such as NZBC G12 and B2. 
  • The installation complies with the safety code: AS/NZ3500.2.2 or BS5572  (This also ensures that cross connection and or back-flow prevention devices are installed, Temper and PE device settings are checked and, where applicable, equipotential is restored). 
  • The installation includes a straight waste-feeder-pipe section of a minimum of 200mm to the HB unit as this will affect the discharge design flow pattern and momentum.
  • The unit is securely installed firmly in a leveled position.
  • The heat exchanger is >95% covered by the waste flow at 5 litres per minute. 
  • Ensure periodic inspections are carried out to maintain best efficiency. With floor penetrating access this is a quick and easy job.