Joule Cyclone Servicing & Repair
G3 qualified annual servicing and repair for Joule Cyclone and Cyclone Plus unvented cylinders — standard, slimline, horizontal and high-gain heat pump models — across Orpington, Bromley, Sevenoaks and Kent. £140 with no VAT.
Joule Servicing
- £140 full G3 annual service, no VAT
- £285 cylinder + heat pump together
- Cyclone & Cyclone Plus, all formats
- Service Log Book filled in every visit
- Valves tested at 6 bar and 7 bar / 90°C
The Joule Guarantee and the Log Book
Joule cylinders are made from duplex stainless steel, and Joule's manual describes a fully transferable 25-year guarantee on the stainless vessel against faulty materials or manufacture. The expansion vessel and cold water controls carry a shorter, two-year guarantee.
The conditions are specific: the cylinder must have been serviced annually, and the Service Log Book completed after each annual service. If your log book is blank, the guarantee may be harder to rely on than you think — I fill it in on every visit and give you a written record as well.
Because the guarantee is transferable, a completed log book is useful paperwork to hand over if you sell the house.
What I Check on a Cyclone
Working pressure at 3 bar
The inlet control set holds the cylinder at 3 bar, and Joule allows mains pressure of up to 10 bar going into it. I check what your mains actually delivers and what the cylinder sees after the reducing valve.
Expansion relief valve at 6 bar
The first safety valve to open if pressure rises. Operated by hand and watched at the tundish.
T&P valve at 7 bar and 90°C
The last line of defence against overheating and over-pressure. Tested, the reseat checked, and the discharge route checked against Approved Document G3.
Expansion vessel pre-charge
Set to the figure given for your cylinder at its working pressure, with the system drained down so the reading is true rather than a guess.
Horizontal and loft installations
Joule makes horizontal Cyclones for lofts and eaves. Access is the main challenge, and discharge pipework from a loft needs particular care to stay compliant.
Joule Faults I See
Tundish discharging
Lost expansion space first, the valve seat second. After a vessel has failed, the expansion relief valve has often been opening for weeks, and its seat may need cleaning or the cartridge replacing.
Hot pressure lower than cold
Usually the inlet strainer, silted up with debris from the mains.
A high-gain cylinder not keeping up with a heat pump
If hot water recovery is slow, the cause is often the heat pump's hot water settings or a diverter valve rather than the cylinder.
Staining around the immersion boss
A weeping immersion seal shows as staining or corrosion around the boss. Caught early it is a gasket, not a cylinder.
What It Costs
A full G3 annual service of a Joule cylinder is £140 with no VAT, and you get a written inspection record. If you have a heat pump as well, servicing both in one visit is £285.
Repairs are quoted at a fixed price before I start, and the log book is updated with whatever was replaced.
No call-out fee, and I'm not VAT-registered, so the price I quote is the price you pay.
Joule Cylinder Questions
Book Your Joule Service
£140 with no VAT, Service Log Book completed every visit, across Orpington, Bromley, Sevenoaks and Kent.
07717 846247
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Brands and faults I deal with every week.