Ideal HP290 DHW Pre-Plumbed Cylinder with Buffer 300L 1 Zone
Ideal HP290 DHW Pre-Plumbed Cylinder with Buffer 300L 1 Zone
The Ideal HP290 300 L is a single zone pre-plumbed DHW cylinder with integrated buffer, supplied fully pre-plumbed, pre-wired and configured for the HP290 heat pump range. It holds 287 litres of stored hot water alongside a 63.5 litre integrated buffer, and reheats from 10 °C to 50 °C in 44.09 minutes.
A pre-plumbed cylinder arrives with the heat pump's hydraulics already built onto it and wired into a factory-fitted control box. This version also carries an integrated buffer tank in the same cabinet, which is what gives the heat pump the open volume it needs to run a defrost cycle and to keep modulating instead of short cycling when the zone valves close.
The buffer matters more than it looks. A heat pump needs a minimum volume of water open to it at all times so it can reverse the cycle to defrost the outdoor coil, and radiators sitting behind thermostatic valves do not count towards that volume. Without a buffer or a volumiser most retrofits cannot meet the requirement, so building one into the cylinder cabinet saves both the floor space and a second set of connections.
What is included
Every item below is factory fitted and wired before the cylinder leaves Ideal:
- Control box
- Buffer tank
- Heat pump filter
- DHW 3-port valve
- P&T relief valve
- High temperature cut out
- Expansion vessel
- Pressure gauge
- Automatic air vent(s)
- Isolation valves
- 3 kW immersion heater
- Circulation pump(s)
- Flow and return thermistors
- DHW thermistor
- Outdoor sensor
Specification
| Stored hot water capacity | 287 litres |
| Integrated buffer volume | 63.5 litres |
| Energy efficiency class | B |
| Standing heat loss | 68 W |
| Reheat time, 10 °C to 50 °C | 44.09 minutes |
| Primary heat exchanger surface area | 3 m² |
| Immersion heater | 3 kW |
| Secondary return connection | Yes |
| Overall dimensions (W × D × H) | 705 × 780 × 2,128 mm |
| Cylinder diameter | 630 mm |
| Cylinder height | 2,049 mm |
| Weight empty | 87 kg |
| Weight full | 437.5 kg |
| Cylinder material | Stainless steel |
| Ideal product code | 240136 |
Reheat time is measured to HWA Heat Pump Test 002:2020, 0.42 l/s at 55 °C flow temperature. Check the full weight against the floor before siting a cylinder this size: at 437.5 kg it is a structural consideration, not just a plumbing one.
Warranty
25 years on the stainless steel cylinder, plus 2 years parts and labour on components. Ideal's terms and conditions apply, including registration and annual servicing.
Works with these heat pumps
This cylinder is supplied configured for the Ideal HP290 range:
- Ideal HP290 — Ideal HP290 4.5kW Air Source Heat Pump, Ideal HP290 6.0kW Air Source Heat Pump, Ideal HP290 8.0kW Air Source Heat Pump and the rest of the heat pump range
Additional suggested items
Commonly ordered alongside a pre-plumbed cylinder:
- Ideal Expansion Vessel - 35L — the expansion vessel Ideal specifies for the 300 litre cylinder
- Ideal Magnetic Filter — captures the magnetite a strainer cannot, protecting the plate heat exchanger
- Intatec Zero Anti-Freeze Valve 28mm — mechanical frost protection for the external pipework, works without power
The datasheet, installation manual and user guide are in the Documents tab above. Pricing a full system? Contact our sales team at sales@clearraysolar.com.
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Delivery times vary by region:
- UK — 1-2 business days
- Highlands & Islands — 1-2 business days
Returns accepted within 14 days of delivery for unused items in original packaging.
