The Ideal System Ready range is a factory pre-plumbed and pre-wired indirect unvented hot water cylinder, built in duplex stainless steel and supplied complete with every valve, control and safety device required for a Building Regulations Part G3-compliant installation. Designed to pair with a gas or oil system boiler, the cylinder arrives with its combination inlet group, pressure and temperature relief valve, dual control/overheat thermostat, motorised zone valve, filling loop and 3kW immersion heater already fitted and tested at the factory — leaving the installer to make the primary, hot water and electrical connections rather than assemble the safety kit on site. Available in 180L, 210L, 250L and 300L capacities to suit anything from a one-bathroom flat to a multi-bathroom family home.
Duplex SS
Cylinder Material
25 Years
Cylinder Warranty*
Part G3
Compliant Package
🔴 Unvented System — Competent Person Required
This is a G3-compliant unvented hot water storage system and must be installed, commissioned and serviced by a suitably qualified and competent installer (e.g. G3 unvented hot water systems qualified), in accordance with Section G3 of the Building Regulations. The factory-fitted safety devices — the pressure and temperature relief valve and the energy cut-out thermostat — must never be removed, bypassed or modified.
🟡 Order As 'System Ready' — Not the Standard Ideal Pro
The base Ideal Pro cylinder and the System Ready pre-plumbed version share the same stainless steel vessel, but only the System Ready reference (product codes ending 'PPSR') includes the factory-fitted pipework, manifold, zone valve, wiring junction box and filling loop shown in this listing. Always specify the 'System Ready' reference when ordering — the manufacturer's own documentation flags this distinction explicitly.
🟢 Secondary Return Only on 210L and Above
The 22mm secondary hot water return connection is fitted as standard on the 210L, 250L and 300L models. It is not fitted on the 180L model, which is typically installed in smaller properties where a secondary circulation loop isn't required.
Factory Pre-Plumbed & Pre-Wired
All primary and potable pipework, the manifold assembly, wiring junction box and central heating zone valve are fitted and tested before the cylinder leaves the factory. Only the immersion heater is fitted on-site, which cuts installation time significantly compared with plumbing a bare cylinder and separate G3 kit from scratch.
Duplex Stainless Steel Vessel
The cylinder body is manufactured in high-grade duplex stainless steel, chosen for its resistance to pitting and stress corrosion in UK mains water conditions, and backed by high-density HCFC-free foam insulation with zero ozone-depletion potential.
Complete G3 Safety Package Included
Every unit ships with the combination inlet group (pressure-reducing valve, strainer, check valve, balanced cold take-off and expansion relief), a pressure and temperature relief valve set to 89–96°C/6 bar, a dual control/overheat thermostat, and a tundish — the full set required to meet Approved Document G3 without sourcing additional parts.
Indirect Coil for Gas or Oil Boilers
A high-efficiency internal primary coil heats the stored water from any gas or oil-fired system boiler, with the coil surface area increasing from 0.78m² on the 180L/210L models to 0.97m² on the 250L/300L models to maintain fast recovery as capacity increases.
3kW Immersion Backup on Every Size
A 3kW, 240V immersion heater is fitted 1¾" BSP into every model in the range, giving off-peak or backup electric heating independent of the boiler — useful during boiler servicing or as part of a Legionella pasteurisation cycle.
Sized Expansion Vessel Per Model
The pre-charged potable expansion vessel is matched to each cylinder size — from 18 litres on the 180L up to 35 litres on the 300L — so the correct expansion capacity is already accounted for in the pre-plumbed kit rather than needing to be selected separately.
Factory-fitted and tested components (System Ready kit):
- Combination inlet group — pressure-reducing valve, strainer, check valve, balanced cold take-off and expansion relief valve
- Pressure and temperature relief valve (89–96°C / 6 bar)
- Dual control thermostat and combined energy cut-out (overheat) thermostat
- Motorised 2-port (22mm) zone valve for the central heating primary circuit
- Wiring junction box for the primary system
- Manifold assembly with central heating zone 1 (22mm) and optional zone 2 connection
- Sealed system filling loop and manual air vent
- Potable expansion vessel with integral wall-mounting bracket, sized per model
- Tundish for safety valve discharge
- 3kW immersion heater (1¾" BSP) — supplied loose for on-site fitting, complete with control and cut-out thermostats
- Technical and user product literature, including Benchmark Checklist
Model overview:
| Model |
MPN |
Nominal Capacity |
Energy Class |
GTIN / EAN |
Empty Weight |
Full Weight |
| Ideal 180L System Ready |
IDEPROIN180PPSR |
178L |
B |
5022142180681 |
30 kg |
208 kg |
| Ideal 210L System Ready |
IDEPROIN210PPSR |
208L |
B |
5022142180698 |
33 kg |
241 kg |
| Ideal 250L System Ready |
IDEPROIN250PPSR |
248L |
C |
5022142180704 |
38 kg |
286 kg |
| Ideal 300L System Ready |
IDEPROIN300PPSR |
287L |
C |
5022142180711 |
43 kg |
330 kg |
Manufacturer's model selection guide (based on maximum simultaneous hot water demand):
-
180L — up to 1 bathroom + 2 separate shower rooms (or 2 bathrooms), up to 7 bed spaces
-
210L — 2 bathrooms + 1 separate shower room, up to 7 bed spaces
-
250L — 2 bathrooms + 2 separate shower rooms, up to 7 bed spaces
-
300L — 3 bathrooms + 2 separate shower rooms, up to 9 bed spaces
For high-specification dwellings, the manufacturer recommends stepping up one model size from this guide.
| Dimensions & Weight |
| Overall height (180L) |
1306 mm |
| Overall height (210L) |
1494 mm |
| Overall height (250L) |
1744 mm |
| Overall height (300L) |
1990 mm |
| Overall diameter (all models) |
550 mm |
| Minimum cupboard footprint |
650 mm × 650 mm |
| Heating Performance |
| Primary coil rating (180L / 210L) |
19 kW / 20.5 kW |
| Primary coil rating (250L / 300L) |
21.5 kW / 25 kW |
| Primary coil surface area (180L / 210L) |
0.78 m² |
| Primary coil surface area (250L / 300L) |
0.97 m² |
| Pressure loss across primary coil (180L / 210L) |
0.216 bar |
| Pressure loss across primary coil (250L / 300L) |
0.241 bar |
| Heat-up time 15°C–60°C (180L / 210L) |
30 / 32 minutes |
| Heat-up time 15°C–60°C (250L / 300L) |
36 / 38 minutes |
| Standing heat loss (180L / 210L) |
55 / 62 W (1.32 / 1.49 kWh per 24h) |
| Standing heat loss (250L / 300L) |
74 / 86 W (1.78 / 2.06 kWh per 24h) |
| Safety & Operating Pressures |
| Max. inlet pressure to PRV |
12 bar |
| Operating pressure (PRV setting) |
3 bar |
| Expansion relief valve setting |
4.5 bar |
| P&T relief valve opening pressure |
6 bar |
| P&T relief valve opening temperature |
89–96°C |
| Energy cut-out thermostat setting |
85°C |
| Max. working pressure — primary heat exchanger |
6 bar |
| Manufacturing standard |
BS EN 12897 |
| Building Regulations compliance |
Part G3 (England & Wales) / P3 (Scotland) / P5 (NI) |
| Electrical & Immersion |
| Immersion heater rating |
3 kW, 240V AC |
| Immersion heater connection |
1¾" BSP |
| Expansion Vessel (Pre-Charged to 3 bar) |
| 180L model |
18 litres |
| 210L model / 250L model |
25 litres |
| 300L model |
35 litres |
| Connections |
| Hot water draw-off |
22 mm |
| Cold water supply |
22 mm |
| Boiler flow |
28 mm |
| Central heating zone connections |
22 mm |
| Secondary hot water return (210L / 250L / 300L only) |
22 mm plain pipe |
| Warranty |
| Stainless steel cylinder vessel |
25 years (subject to T&Cs) |
| Parts & labour |
2 years (typical, subject to registration) |
What's the difference between the Ideal Pro and Ideal System Ready cylinder?
They use the identical stainless steel cylinder, but the System Ready version is factory pre-plumbed with the full G3 safety kit, manifold, zone valve and wiring junction box already fitted and tested — reducing on-site plumbing and wiring work. The standard Ideal Pro is supplied with the same components loose, for the installer to fit.
Does the Ideal System Ready cylinder work with an oil boiler as well as gas?
Yes. The indirect coil is suitable for both gas and oil-fired system boilers, and works with open-vented or sealed pumped primary systems. If used on a sealed primary system, the boiler must have its own energy cut-out/overheat thermostat.
Which size cylinder do I need?
This depends on the number of bathrooms and bed spaces in the property. As a guide: 180L suits up to 2 bathrooms/shower rooms, 210L suits 2 bathrooms plus a separate shower room, 250L suits 2 bathrooms plus 2 shower rooms, and 300L suits larger homes with 3 bathrooms and 2 shower rooms. Higher-specification homes should generally step up one size.
Does it come with a secondary hot water return?
The 210L, 250L and 300L models are fitted with a 22mm secondary return connection as standard. The 180L model does not include this connection.
Can this cylinder be installed anywhere in the house?
As an unvented mains-pressure cylinder it doesn't need a cold water storage tank in the loft, so it can be sited in an airing cupboard, utility room or similar space with a minimum footprint of 650mm × 650mm. It must be installed by a G3-qualified competent person, with the safety valve discharge pipework routed to a safe, visible discharge point as required by Building Regulations.
Is annual servicing required?
Yes. As an unvented hot water storage vessel it requires routine annual maintenance alongside the boiler service — checking the relief valves discharge and re-seat correctly, cleaning the inlet strainer, checking the expansion vessel charge pressure, and updating the Benchmark Service Record.
