01 — Heaters compared
Heaters compared
02 — Key facts
Key facts
- Heaters checked
- 107
- Power range
- 0.3–30kW
- Cheapest
- £48
03 — Compare room volume and supply phase
Compare room volume and supply phase
Use the listed room-volume range to narrow your choice rather than comparing power alone. Harvia The Wall SW45E is listed at 4.5kW for 3–6m³. The 8kW Helo Hanko STJ covers 8–12m³, while the 8kW Narvi NC covers 8–14m³. These ranges differ even where power ratings match.
For larger rooms, the 12kW Harvia Hidden HH12 lists 12–17m³. The 36kW Harvia Qube Pro lists 40–75m³. Both are recorded as three-phase. Check the phase on your chosen listing: the 4.5kW Pillar IKI is also three-phase, while the 4.5kW Harvia The Wall SW45E is single-phase.
04 — Check controls and what the price covers
Check controls and what the price covers
Compare control arrangements alongside starting prices. Harvia The Wall SW45E starts at £455 and uses a separate control unit, sold separately. The SW45 Black Steel starts at £669.63 and has built-in illuminated switches. The Harvia Cilindro PC90XE has a digital control panel included.
Keep accessories separate when comparing prices. The HUUM heat retainer for pre-2024 DROP models is an accessory, while the HUUM DROP Electric Sauna Heater is listed from £429.99. Those entries describe different products, not alternative prices for the same heater.
05 — Frequently asked questions
Frequently asked questions
Not sure what size you need?
Work out the right kW for your room from its size, insulation and glass.
Heater size calculator