Head to head
Telford Tempest 300 Indirect vs Vaillant aroTHERM plus 7kW
The Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres. The Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kw heat output.
Last reviewed 13 September 2026
Specifications side by side
| Telford Tempest 300 Indirect | Vaillant aroTHERM plus 7kW | |
|---|---|---|
| Dimensions | 1750 mm high x 580 mm diameter | 1565 x 1100 x 450 mm (H x W x D) |
| Weight | 61 kg | 194 kg (operating) |
| Capacity | 300 litres | - |
| Material | 2304 duplex stainless steel | - |
| Relief valve setting | 7 bar / 90C | - |
| Immersion heater | 3kW, 240V single phase, included | - |
| Warranty | Lifetime guarantee on the body with annual service, 2 year component guarantee | - |
| Heat output | - | 7 kW |
| SCOP | - | up to 5.03 |
| Refrigerant | - | R290 (propane), low GWP |
| Sound power | - | 58 dB(A) at A7/W35, 60 dB(A) at A7/W55 |
| Max flow temperature | - | 75C |
Sources: Telford Tempest 300 Indirect, Vaillant aroTHERM plus 7kW. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the Tempest 300 Indirect if...
A 300 litre indirect cylinder for a larger household or a property with high simultaneous hot water demand, part of Telford's Tempest range. Like the smaller direct model it carries a lifetime body guarantee when serviced annually.
Full Tempest 300 Indirect specifications →Buy or hire the aroTHERM plus 7kW if...
A mid-size aroTHERM plus for a typical three-bed house. It is taller and heavier than the 5kW unit, reflecting a larger outdoor cabinet, and shares the same R290 refrigerant and 75C maximum flow temperature.
Full aroTHERM plus 7kW specifications →Common questions
What is the difference between the Telford Tempest 300 Indirect and the Vaillant aroTHERM plus 7kW?
The Telford Tempest 300 Indirect is a indirect unvented hot water cylinder, 300 litres; the Vaillant aroTHERM plus 7kW is a r290 monobloc air source heat pump, 7 kW heat output.
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