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For even greater protection of connecting pipework, we recommend Armaflex TuffCoat, this produt is specifically designed to be used for the long term protection and insulation of underground ground source heating pipework.

Armaflex with In-Built Anti-Microbial Protection
Made to withstand mechanical impact, washable and waterproof.
In-built Microban® technology gives Class O Armaflex an added level of protection against harmful microbes such as bacteria, mould and mildew.
Armaflex Tuffcoat is a flexible, closed cell, elastomeric nitrile rubber insulation with a polymeric coating. Based on the excellent technical values of Class O Armaflex it is the perfect solution wherever protection against mechanical impact is required.
With its enhanced surface protection, Armaflex Tuffcoat can even be used on underground pipework - including mains cold water and ground source heat pump pipes.
Armaflex Tuffcoat is available in tubes and coils with a black cover.
New! Built-In Anti-Microbial Protection Reduces Mould and Bacteria Growth
Wash down-waterproof and easy to clean. Suitable for areas which require frequent wash down
Resists damage from mechanical impact
Built in vapour barrier prevents condensation
Semi gloss finish - requires no additional painting
Flexible and Lightweight
Compatible with mains cold water pipes for prevention of freezing
ODP zero
GWP zero
Dust & Fibre free
A cheaper solution is the following material from the same manufacturer with slightly less good durability charachteristics
Synergy Boreholes and Systems Ltd. can, if desired, insulate the pipe runs between the boreholes and the distribution manifold. We use exclusively ARMAFLEX pipe insulation to do this
When to use ARMAFLEX: Not all GSHP installers/manufacturers will recommend the use of pipe insulation.
The following will help you decide whether insulation is required.
The outgoing ("cold") to, and return pipes ("hot") from the boreholes should obviously not be able to absorb heat from, or transfer heat to, each other, as this would directly and adversely affect the efficiency of the installation.
This requires that ideally, the connecting pipework should be in separate trenches, i.e. a "hot" and a "cold" trench. The pipes should be embedded in a generous layer of medium grade sand, this protects the pipes against sharp flints or stones and provides additional thermal insulation. If separate trenches are not possible because of cost or space reasons then a single trench should be as wide as possible with the "hot" pipes on one side and the "cold" on the other. Again, both should be embedded into a layer of sand about 4-6 inches thick.
Pipe insulation can be used to further enhance thermal retention, especially if "hot" and "cold" pipe runs are, of necessity, close together, i.e. less than 24 inches apart. Should only one pipe run be insulated, it is usual to choose the "hot" pipes. To achieve optimum insulation both pipe runs can be insulated. The downside to this, is that in the case of multiple pipes, the insulation will take up considerable space in the trench. Also, not to be forgotten, pipe insulation of this quality is quite expensive and will add several pounds per metre to the pipe run cost.
With its exceptional, inbuilt, water vapour barrier Armaflex is particularly effective at preventing moisture ingress and ensuring long term thermal efficiency. The thermal properties of Armaflex will not rapidly deteriorate over time as may occur with other insulation materials.
Class O Armaflex is the flexible, closed cell, elastomeric, nitrile rubber insulation that offers reliable protection against condensation and effectively prevents energy loss.
Class O Armaflex is dust free, fibre free and CFC free with an ODP of zero. Its inherent attributes and combination of properties makes Armaflex a highly efficient method of insulating hot and cold water services, chilled water lines, heating systems, air conditioning ductwork and refrigerated pipework for condensation control, energy conservation and frost protection.
» New! Built-In Anti-Microbial Protection Reduces Mould and Bacteria Growth
» Built-In Vapour Barrier Prevents Condensation
» Reduce Energy Losses Up to 87%
» Lightweight and flexible, easy installation with low maintenance requirements, resulting in time and cost savings
» Excellent resistance to the effects of ozone, oil and chemicals

Available in Single & Twin configurations in the following sizes:
Coils:
25mm, 32mm, 40mm, 50mm, 63mm,
Sticks: 110mm
Twin pipes up to 63mm,
Single pipes up to 110mm
Watertight bond between foam and outer casing.
Main advantages
· Temperature Range -15oC up to +95oC
· Unique construction
· Water tight bond between corrugated outer pipe and polyolefine insulation.
· Top foam quality (Thermo Plastic Elastomer) – proven λ = 0,031 W/mK at 50° C
· Water diffusion resistance μ>3.500
· Light weight system (1.6 kg for 2x32 in 125 outer casing)
· High flexibility at low temperatures <0°C
· Highly flexible – easy to bend around corners
· Single lines 25 – 110 mm and twin lines 25 – 63 mm
· Easy to install, full range of easy to use fittings
· Built in expansion compensation
· Very low friction loss – proven for high flow speed
· Pressure hammer absorption
General Information on Polybutene pipes:
Far more flexible than other plastic pipes Comparison Material E-module (stiffness) [N/mm2] Polybutene 420 PE-X 600 (40% stiffer than Polybutene) Polypropylene 800 (90% stiffer than Polybutene)
Polybutene is the most flexible pipe system for heating and cooling
They are tested to higher pressures than other plastic pipes.
Polybutene is the proven, reliable, robust pipe system