The OSO Multipoint W is a compact direct electric hot water heater built for locations where space is tight but hot water demand is real — bedsits, small flats, holiday lets, and light commercial washrooms. Available in 30, 50, 80 and 100 litre capacities, every size shares the same 435 mm diameter footprint, so it slots into a standard kitchen base unit, an airing cupboard, or a wall-mounted bracket without a bespoke enclosure.
Inside, a 3 kW INCOTEC immersion heater stores water at 70°C rather than the usual 60°C, then blends it back down to a safe delivery temperature through a factory-set tamperproof blending valve. Storing hotter and blending down means each unit yields roughly 20% more usable hot water than a same-sized cylinder running straight at 60°C — in practice, that lets a smaller, cheaper unit do the job a larger cylinder would otherwise need to.
435 mm
Diameter, all sizes
+20%
Usable hot water vs 60°C fill
10 yrs
Stainless tank warranty
Floor or wall mounted
Same 435 mm diameter body across all four sizes means one footprint works whether the unit sits on the floor or hangs from the supplied wall bracket.
3 kW INCOTEC immersion
A dedicated 3 kW immersion heater gives faster recovery than lower-wattage direct cylinders of similar size, so hot water returns to full temperature sooner between uses.
Tamperproof blending valve
Water is stored at 70°C and blended down to a safe outlet temperature via a factory-set, tamperproof valve — delivering around 20% more usable hot water than an equivalent 60°C-stored cylinder.
NANOPUR insulation
High-performance NANOPUR insulation keeps standing heat loss low across the range (22W on the 30L rising to 45W on the 100L), reducing background running costs.
Stainless steel tank, 10-year warranty
The tank body is high-grade stainless steel, backed by a 10-year manufacturer warranty against corrosion.
Complete G3 fittings kit
Every unit ships with the full G3-compliant fittings kit — temperature & pressure relief valve, thermostat, flexi hoses and wall bracket — for a compliant, ready-to-install package.
Suitable For
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Bedsits and small flats needing a compact, self-contained hot water source with no boiler dependency.
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Light commercial and rental properties — guest houses, HMOs, and managed lets where reliable, low-maintenance hot water matters.
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Single shower installations — the 50L and 80L models are sized to comfortably support one shower.
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Space-constrained installs — kitchen base units, utility cupboards, and loft or under-stair spaces where a standard unvented cylinder won't fit.
G3 compliance and installation
This is an unvented direct electric water heater and falls under Building Regulations Part G3 in England & Wales (or the equivalent local regulation). Installation must be carried out or signed off by a competent, G3-qualified installer, with the supplied safety valve, expansion provision and discharge pipework correctly fitted and tested before use.
Technical Specification
General
Brand OSO Hotwater
Range Multipoint W (Floor & Wall Mounted)
Type Direct electric, unvented water heater
Available sizes 30L, 50L, 80L, 100L
Diameter (all models) 435 mm
Tank material Stainless steel
Insulation NANOPUR
Energy rating (ErP) C — all sizes
Warranty 10 years, stainless steel tank
Performance
Immersion heater 3 kW INCOTEC — all sizes
Storage temperature 70°C (blended down via tamperproof valve)
Delivered water temperature Approx. 60°C at outlet
Usable capacity gain ~20% more usable hot water vs. a 60°C-stored equivalent
Installation
Mounting Floor standing or wall mounted (bracket supplied)
Fittings supplied T&P safety valve, thermostat, wall bracket, mains power cable, CW/HW flexi hoses, G3 inlet group kit, installation manual
Regulatory compliance Building Regulations Part G3 (unvented hot water)
Electrical connection Factory-fitted mains cable, 230V single phase
Size & Performance by Model
Model
Capacity
Height
Empty weight
V40 usable @ 40°C
Recovery time
Heat loss
Multipoint W30
30L
622 mm
14 kg
52L
32 min
22W
Multipoint W50
50L
785 mm
17 kg
84L
46 min
29W
Multipoint W80
80L
1105 mm
24 kg
132L
80 min
36W
Multipoint W100
100L
1325 mm
28 kg
168L
92 min
45W
Frequently Asked Questions
What's the difference between the storage temperature and the water I actually get at the tap?
The Multipoint W stores water at 70°C inside the tank, then a factory-set tamperproof blending valve mixes it down to a safe delivery temperature of around 60°C before it reaches any outlet. Storing hotter and blending down is what gives the unit roughly 20% more usable hot water than a same-sized cylinder that only stores at 60°C.
Can I install a Multipoint W myself?
No. As an unvented direct electric water heater, installation falls under Building Regulations Part G3 and must be carried out or signed off by a competent, G3-qualified installer. The unit ships with the full fittings kit required for a compliant install, but the safety valve, discharge pipework and expansion provision all need professional commissioning.
Which size do I need for a single shower?
OSO's own data identifies the 50L and 80L models as suitable for single shower use, with the 80L giving noticeably more usable volume (132L at 40°C) for back-to-back use. The 30L and 100L are aimed more at basin/sink-only duty and higher-capacity or multi-outlet demand respectively — for exact flow-rate suitability against your shower's requirements, check the fitting's litres-per-minute rating.
Can the same unit be floor standing or wall mounted?
Yes — every Multipoint W ships with a wall bracket included as standard, and the 435 mm diameter body is identical across all four capacities, so the same physical footprint works whether the unit is floor standing or hung on a wall.
How long does it take to recover a full tank of hot water?
Recovery time scales with capacity: roughly 32 minutes for the 30L, 46 minutes for the 50L, 80 minutes for the 80L, and 92 minutes for the 100L, all driven by the same 3 kW INCOTEC immersion heater.
What's included in the box?
Each unit is supplied complete with a T&P safety valve, thermostat, wall bracket, factory-fitted mains power cable, CW/HW flexi hoses, the G3 inlet group kit, and an installation manual — everything a G3-qualified installer needs to complete a compliant installation.
