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Suitability


Can a HeatBack be retrofitted? 
Yes.

For what type of dwelling is it suitable?
HeatBack was designed to be suitable for all dwelling types, including single story dwellings.

For what type of supply pressures was HeatBack designed? 
Heat transfer is achieved by exploiting pipe friction for turbulence. Using a single transfer wall this produces a quick response and higher thermal power relative to double wall systems.  As a  consequence some additional line pressure is required.
An unequal line pressure system, (Model HB65A takes in from a 75 kPa cold supply and feeds to the 35kPa PLV at the HW cylinder's cold water intake), is the minimum requirement. For retrofitting, the lower pressure limit is also determined by the pre-existing situation. Best judged by your experienced installer. 
Pressure drop: At 1 bar over atmospheric pressure and flow rate of 6L/minute, with the system operating and measured at the HB unit's intake, the pressure drop for Model HB65A is <50 kPa and for HB65B <20 kPa.

Is HB suitable for all configurations? 

The HeatBack design employs virgin copper (C12200 to EN1057 or ASTM B88 and NSF-61).  It is suitable for use as a direct and an indirect exchanger. (wtw or coil-to-coil). The heat transfer medium fluid chosen must not be corrosive to copper. See ‘corrosion resistance’ below. It can be used with potable water and may be used as a single wall, direct heat exchanger in jurisdictions that allow such installations. You must however ensure that it is safely installed using back-flow and cross-connection prevention measures. (Check presence of non return valve in water pipe and Gully trap downstream in the drain)

Why bother while I use solar energy for my hot water?
That's a good solution. You may still reconsider and add to this because with a HeatBack you can reduce your kWh load and reduce storage capacity and will need decidedly fewer sunshine hours. Besides, the shorter the days, the colder it gets, the higher the output of a HeatBack and the longer the solar collector and HW tank will last. It's more likely you will not run out of water again.
The combination of PV solar panels and a HeatBack will get you much closer to being independent from the grid.

Why bother while I use a heat pump for my hot water?
Because reusing your waste energy complements all other energy solutions. It allows you to lower the kWh load. HeatBack is particularly useful when it gets really cold. As well, your heat pump will last decidedly longer and the combination of a HeatBack with other energy sources would get you much closer to being independent from the grid.

Have you already engaged in alternative energy systems for your household? 
HeatBack Is a low cost entry solution and works very well in combination with other strategies to better cover your energy needs all year round. It also allows you to lower the kWh load and reduce storage capacity.

Do you know of a good combination of sustainable energy systems? 
When the production of heat in a solar system decreases in winter, the thermal output of a waste heat exchanger increases with lower temperatures. So they make a good combination.

Do you believe that using less electricity, gas, fossil or solid fuel to reduce harmful emissions is a must-do if your level of comfort can stay the same?
Of course! And with a HeatBack you can do it at the same level of comfort as you are enjoying now. 

What are average domestic Flow Rates? 
For shower use in homes this is regulated and reported to be from 5 (low pressure) to 13 litres (medium to mains pressure) per minute. You will be asked what you prefer.

What does Short-Burst-Use mean? 
Short showering, rinsing dishes and hand-washing are examples of this. Some heat exchangers other than HeatBack only act as heat sinks for the first few minutes.

What makes a HB different from others? 
Heatback will fit where others won't. May be used as an indirect exchanger and, direct exchanger (where jurisdictions allow), it is of single wall construction = faster response and more compact as the heat transfer process is horizontal, e.g. gravity assisted and centrifugal. (Other systems, such as shell in coil types, are prone to stratification. They invite centrifugal forces to push the cold molecules of the medium to travel the furthest away from the warm spillage ones in the shell as the cold molecules are heavier).
HB also offers In-service access for lifelong optimum efficiency and installs independently from other works. (Stand alone).

What could be a (perceived) disadvantage of HB? 
This unit doesn't do a 20mm pipe size as with an instantaneous gas heater you still need to preserve the high flow rate.

By using 20mm pipe through the exchanger the heat transfer efficiency is very much flawed. However, you can configure our smaller pipe models to feed the shower mixer only. That way the cold feed to the gas heater is unrestricted.

If the hot water is electronically controlled, the demand temperature should be set just above the required temperature at the shower rose, so that uneven flows are effectively operating.

Inside model A,  uneven flows in the exchanger produce a better than 50% thermal return.                        Alternatively the B model may be used for connecting either way. This one is designed for 20L/min. flow rate, as within pipe sizing/noise regulation. It will cope with more than that by the way, at times of full-on simultaneous use.