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Strom 9kW Electric Heat Only Boiler & 150L Pre-Plumbed Indirect Cylinder – SBSP9H150P
The Strom 9kW Electric Heat-Only Boiler with 150L Pre-Plumbed Indirect Cylinder (SKU: SBSP9H150PP) is a complete, factory-assembled one-box heating and hot water system for properties without a mains gas connection. The 9kW single-phase electric boiler arrives pre-mounted on the outside of the 150L duplex stainless steel unvented cylinder, with the expansion vessel, circulator pump, pressure gauge, filling loop and safety controls all factory-fitted. On site, only the flow, return, cold supply and electrical connections need to be made — no boiler assembly, no pump or vessel mounting, no guesswork. The cylinder uses Strom's Prime2o duplex stainless steel construction, with 50mm insulation and a coil rated at 19.94 kW for fast indirect heat-up from the boiler circuit. Backed by a 25-year manufacturing guarantee on the cylinder and a 2-year warranty on the boiler (registration within 45 days required). Suitable for: 2–3 bedroom property (well-insulated semi or end-terrace).
9kW
Heat Output
150L
Cylinder
25 yr
Cyl Guarantee
2 yr
Boiler Warranty
10 bar
Max Pressure
No Flue
Required
⚠ G3 & Electrician Required: The cylinder is unvented (pressurised). Installation must be carried out by a G3 Competent Person for the cylinder and a qualified electrician for the boiler wiring. Building Regulations Part G applies.
⚠ Boiler Warranty Registration: The 2-year boiler warranty must be registered within 45 days of purchase at stromltd.com. Retain the invoice as proof of purchase.
Key Features
One-Box System — Boiler and Cylinder Factory-Mounted Together
The 9kWkW heat-only boiler is mounted directly onto the outside of the 150L pre-plumbed cylinder before despatch, arriving as a single ready-to-position unit. Expansion vessel, circulator pump, pressure gauge, filling loop and safety controls are all pre-fitted — only the flow, return, cold water and electrical connections need to be made on site.
Pre-assembledPre-plumbedMinimal site work
Duplex Stainless Steel Prime2o Cylinder — 25-Year Manufacturing Guarantee
The cylinder is manufactured from duplex stainless steel — the same alloy grade used in marine and chemical processing applications for its superior resistance to corrosion and stress cracking. Strom backs it with a 25-year manufacturing guarantee. 50mm PU foam insulation minimises standby heat loss for efficient round-the-clock performance. Rated to 10 bar maximum working pressure and 3 bar fill pressure.
Duplex stainless steel25-yr cylinder guarantee10 bar rated
Serpentine Heating Element Technology — Efficient and Reliable
The boiler uses Serpentine heating element technology — a continuous wound element with a larger heat-transfer surface area than dry-core or standard sheathed elements. This means more efficient heat transfer to the system water, lower surface temperature per watt, and extended element life compared with conventional designs.
Serpentine elementHigh heat transferLong element life
Touchscreen Control Display — Simple On-Site Commissioning
The boiler features a touchscreen control panel with backlit display. Flow temperature is adjustable from 20°C to 80°C in 1°C steps. The display shows current flow temperature, set-point, fault codes and system pressure at a glance. No separate programmer is included — the boiler integrates with standard wiring centres, room thermostats and zone valves.
Touchscreen20–80°C rangeFault code display
No Flue, No Gas, No Carbon Monoxide — Safe for Any Location
As a fully electric system, the Strom boiler requires no flue, no gas supply and produces no carbon monoxide. It can be sited in cupboards, utility rooms or any location where a gas or oil boiler would not be permitted or practical. Ideal for off-grid properties, flats, conversions and commercial premises without a mains gas connection.
No flue neededNo gas supplyZero CO outputOff-grid ready
Solar Panel Compatible — Reduce Running Costs with PV
The boiler is compatible with solar PV panels via an appropriate solar diverter (such as Solar iBoost+ or myenergi eddi). Surplus solar generation can be diverted to heat the cylinder immersion, substantially reducing electricity running costs. The pre-plumbed cylinder includes a single immersion heater boss for direct electric top-up.
Solar PV compatibleImmersion boss includedDiverter-ready
Heating Pressure Range: 0.5–1.5 Bar — Standard Sealed System
The boiler operates within a 0.5 to 1.5 bar sealed heating circuit pressure range. The pre-fitted expansion vessel accommodates normal system expansion. A pressure relief valve and filling loop are included. System pressure is displayed on the touchscreen — no separate pressure gauge dial to read.
0.5–1.5 bar working pressurePRV + filling loop includedExpansion vessel pre-fitted
Qualified Installation Required — G3 Competent Person + Qualified Electrician
The cylinder is unvented (pressurised) and must be installed by a G3 Unvented Competent Person in accordance with Building Regulations Part G. The boiler wiring must be carried out by a qualified electrician to BS 7671. Strom recommend a dedicated RCD-protected circuit for the boiler. Boiler warranty requires registration within 45 days of purchase at stromltd.com.
G3 competent personQualified electricianRegister within 45 days
Technical Specifications
| Boiler | |
| Heat Output | 9kW |
| Power Supply | 230V, single phase |
| Current Draw | 41A |
| Minimum Breaker Size | 50A |
| Minimum Cable Size | 6 mm² |
| Heating Temperature Range | 20°C – 80°C |
| Heating Pressure Range | 0.5 – 1.5 bar |
| Flow & Return Connection | ¾" male (flexi hoses or push-fit recommended) |
| PRV Connection | 15mm compression |
| Boiler Dimensions (H×W×D) | 520 × 235 × 120 mm |
| Controls | Touchscreen with display |
| ERP Rating (Heating) | D |
| Cylinder | |
| Cylinder Type | Pre-plumbed indirect unvented (Prime2o) |
| Nominal Capacity | 150L |
| Actual Capacity | 147 litres |
| Cylinder Material | Duplex stainless steel |
| Insulation | 50mm PU foam |
| Weight Empty | 48 kg |
| Weight Full | 196 kg |
| Heat Loss | 1.32 kWh/24h |
| Coil Rating | 19.94 kW |
| Max Water Pressure | 10 bar |
| Max Fill Pressure | 3 bar |
| Number of Immersions | 1 |
| Cylinder Dimensions (H×W×D) | 1075 × 580 × 660 mm |
| ERP Rating (Cylinder Only) | C |
| Compatibility & Warranty | |
| Heating Type | Heat-only (regular boiler) — requires separate system controls (programmer, room stat, zone valves) |
| Solar PV Compatible | Yes — via solar diverter to immersion |
| SKU / Part Number | SBSP9H150PP |
| Boiler Warranty | 2 years (registration within 45 days at stromltd.com) |
| Cylinder Guarantee | 25-year manufacturing guarantee |
| Manufacturer | Strom Ltd, UK |
Frequently Asked Questions
Related Products
Strom Electric Heat-Only Boiler (Boiler Only)
Boiler-only option for pairing with existing cylinder
Strom Prime2o Unvented Cylinder (Cylinder Only)
Standalone cylinder for pairing with existing boiler
Solar iBoost+ Solar Diverter
Divert surplus PV to heat the cylinder immersion
myenergi eddi PV Diverter
Intelligent solar diverter compatible with this installation
$3,391.72
Strom 9kW Electric Heat Only Boiler & 150L Pre-Plumbed Indirect Cylinder – SBSP9H150P—
$3,391.72
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Strom 9kW Electric Heat Only Boiler & 150L Pre-Plumbed Indirect Cylinder – SBSP9H150P
The Strom 9kW Electric Heat-Only Boiler with 150L Pre-Plumbed Indirect Cylinder (SKU: SBSP9H150PP) is a complete, factory-assembled one-box heating and hot water system for properties without a mains gas connection. The 9kW single-phase electric boiler arrives pre-mounted on the outside of the 150L duplex stainless steel unvented cylinder, with the expansion vessel, circulator pump, pressure gauge, filling loop and safety controls all factory-fitted. On site, only the flow, return, cold supply and electrical connections need to be made — no boiler assembly, no pump or vessel mounting, no guesswork. The cylinder uses Strom's Prime2o duplex stainless steel construction, with 50mm insulation and a coil rated at 19.94 kW for fast indirect heat-up from the boiler circuit. Backed by a 25-year manufacturing guarantee on the cylinder and a 2-year warranty on the boiler (registration within 45 days required). Suitable for: 2–3 bedroom property (well-insulated semi or end-terrace).
9kW
Heat Output
150L
Cylinder
25 yr
Cyl Guarantee
2 yr
Boiler Warranty
10 bar
Max Pressure
No Flue
Required
⚠ G3 & Electrician Required: The cylinder is unvented (pressurised). Installation must be carried out by a G3 Competent Person for the cylinder and a qualified electrician for the boiler wiring. Building Regulations Part G applies.
⚠ Boiler Warranty Registration: The 2-year boiler warranty must be registered within 45 days of purchase at stromltd.com. Retain the invoice as proof of purchase.
Key Features
One-Box System — Boiler and Cylinder Factory-Mounted Together
The 9kWkW heat-only boiler is mounted directly onto the outside of the 150L pre-plumbed cylinder before despatch, arriving as a single ready-to-position unit. Expansion vessel, circulator pump, pressure gauge, filling loop and safety controls are all pre-fitted — only the flow, return, cold water and electrical connections need to be made on site.
Pre-assembledPre-plumbedMinimal site work
Duplex Stainless Steel Prime2o Cylinder — 25-Year Manufacturing Guarantee
The cylinder is manufactured from duplex stainless steel — the same alloy grade used in marine and chemical processing applications for its superior resistance to corrosion and stress cracking. Strom backs it with a 25-year manufacturing guarantee. 50mm PU foam insulation minimises standby heat loss for efficient round-the-clock performance. Rated to 10 bar maximum working pressure and 3 bar fill pressure.
Duplex stainless steel25-yr cylinder guarantee10 bar rated
Serpentine Heating Element Technology — Efficient and Reliable
The boiler uses Serpentine heating element technology — a continuous wound element with a larger heat-transfer surface area than dry-core or standard sheathed elements. This means more efficient heat transfer to the system water, lower surface temperature per watt, and extended element life compared with conventional designs.
Serpentine elementHigh heat transferLong element life
Touchscreen Control Display — Simple On-Site Commissioning
The boiler features a touchscreen control panel with backlit display. Flow temperature is adjustable from 20°C to 80°C in 1°C steps. The display shows current flow temperature, set-point, fault codes and system pressure at a glance. No separate programmer is included — the boiler integrates with standard wiring centres, room thermostats and zone valves.
Touchscreen20–80°C rangeFault code display
No Flue, No Gas, No Carbon Monoxide — Safe for Any Location
As a fully electric system, the Strom boiler requires no flue, no gas supply and produces no carbon monoxide. It can be sited in cupboards, utility rooms or any location where a gas or oil boiler would not be permitted or practical. Ideal for off-grid properties, flats, conversions and commercial premises without a mains gas connection.
No flue neededNo gas supplyZero CO outputOff-grid ready
Solar Panel Compatible — Reduce Running Costs with PV
The boiler is compatible with solar PV panels via an appropriate solar diverter (such as Solar iBoost+ or myenergi eddi). Surplus solar generation can be diverted to heat the cylinder immersion, substantially reducing electricity running costs. The pre-plumbed cylinder includes a single immersion heater boss for direct electric top-up.
Solar PV compatibleImmersion boss includedDiverter-ready
Heating Pressure Range: 0.5–1.5 Bar — Standard Sealed System
The boiler operates within a 0.5 to 1.5 bar sealed heating circuit pressure range. The pre-fitted expansion vessel accommodates normal system expansion. A pressure relief valve and filling loop are included. System pressure is displayed on the touchscreen — no separate pressure gauge dial to read.
0.5–1.5 bar working pressurePRV + filling loop includedExpansion vessel pre-fitted
Qualified Installation Required — G3 Competent Person + Qualified Electrician
The cylinder is unvented (pressurised) and must be installed by a G3 Unvented Competent Person in accordance with Building Regulations Part G. The boiler wiring must be carried out by a qualified electrician to BS 7671. Strom recommend a dedicated RCD-protected circuit for the boiler. Boiler warranty requires registration within 45 days of purchase at stromltd.com.
G3 competent personQualified electricianRegister within 45 days
Technical Specifications
| Boiler | |
| Heat Output | 9kW |
| Power Supply | 230V, single phase |
| Current Draw | 41A |
| Minimum Breaker Size | 50A |
| Minimum Cable Size | 6 mm² |
| Heating Temperature Range | 20°C – 80°C |
| Heating Pressure Range | 0.5 – 1.5 bar |
| Flow & Return Connection | ¾" male (flexi hoses or push-fit recommended) |
| PRV Connection | 15mm compression |
| Boiler Dimensions (H×W×D) | 520 × 235 × 120 mm |
| Controls | Touchscreen with display |
| ERP Rating (Heating) | D |
| Cylinder | |
| Cylinder Type | Pre-plumbed indirect unvented (Prime2o) |
| Nominal Capacity | 150L |
| Actual Capacity | 147 litres |
| Cylinder Material | Duplex stainless steel |
| Insulation | 50mm PU foam |
| Weight Empty | 48 kg |
| Weight Full | 196 kg |
| Heat Loss | 1.32 kWh/24h |
| Coil Rating | 19.94 kW |
| Max Water Pressure | 10 bar |
| Max Fill Pressure | 3 bar |
| Number of Immersions | 1 |
| Cylinder Dimensions (H×W×D) | 1075 × 580 × 660 mm |
| ERP Rating (Cylinder Only) | C |
| Compatibility & Warranty | |
| Heating Type | Heat-only (regular boiler) — requires separate system controls (programmer, room stat, zone valves) |
| Solar PV Compatible | Yes — via solar diverter to immersion |
| SKU / Part Number | SBSP9H150PP |
| Boiler Warranty | 2 years (registration within 45 days at stromltd.com) |
| Cylinder Guarantee | 25-year manufacturing guarantee |
| Manufacturer | Strom Ltd, UK |
Frequently Asked Questions
Related Products
Strom Electric Heat-Only Boiler (Boiler Only)
Boiler-only option for pairing with existing cylinder
Strom Prime2o Unvented Cylinder (Cylinder Only)
Standalone cylinder for pairing with existing boiler
Solar iBoost+ Solar Diverter
Divert surplus PV to heat the cylinder immersion
myenergi eddi PV Diverter
Intelligent solar diverter compatible with this installation
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Strom 9kW Electric Heat-Only Boiler with 150L Pre-Plumbed Indirect Cylinder (SKU: SBSP9H150PP) is a complete, factory-assembled one-box heating and hot water system for properties without a mains gas connection. The 9kW single-phase electric boiler arrives pre-mounted on the outside of the 150L duplex stainless steel unvented cylinder, with the expansion vessel, circulator pump, pressure gauge, filling loop and safety controls all factory-fitted. On site, only the flow, return, cold supply and electrical connections need to be made — no boiler assembly, no pump or vessel mounting, no guesswork. The cylinder uses Strom's Prime2o duplex stainless steel construction, with 50mm insulation and a coil rated at 19.94 kW for fast indirect heat-up from the boiler circuit. Backed by a 25-year manufacturing guarantee on the cylinder and a 2-year warranty on the boiler (registration within 45 days required). Suitable for: 2–3 bedroom property (well-insulated semi or end-terrace).
9kW
Heat Output
150L
Cylinder
25 yr
Cyl Guarantee
2 yr
Boiler Warranty
10 bar
Max Pressure
No Flue
Required
⚠ G3 & Electrician Required: The cylinder is unvented (pressurised). Installation must be carried out by a G3 Competent Person for the cylinder and a qualified electrician for the boiler wiring. Building Regulations Part G applies.
⚠ Boiler Warranty Registration: The 2-year boiler warranty must be registered within 45 days of purchase at stromltd.com. Retain the invoice as proof of purchase.
Key Features
One-Box System — Boiler and Cylinder Factory-Mounted Together
The 9kWkW heat-only boiler is mounted directly onto the outside of the 150L pre-plumbed cylinder before despatch, arriving as a single ready-to-position unit. Expansion vessel, circulator pump, pressure gauge, filling loop and safety controls are all pre-fitted — only the flow, return, cold water and electrical connections need to be made on site.
Pre-assembledPre-plumbedMinimal site work
Duplex Stainless Steel Prime2o Cylinder — 25-Year Manufacturing Guarantee
The cylinder is manufactured from duplex stainless steel — the same alloy grade used in marine and chemical processing applications for its superior resistance to corrosion and stress cracking. Strom backs it with a 25-year manufacturing guarantee. 50mm PU foam insulation minimises standby heat loss for efficient round-the-clock performance. Rated to 10 bar maximum working pressure and 3 bar fill pressure.
Duplex stainless steel25-yr cylinder guarantee10 bar rated
Serpentine Heating Element Technology — Efficient and Reliable
The boiler uses Serpentine heating element technology — a continuous wound element with a larger heat-transfer surface area than dry-core or standard sheathed elements. This means more efficient heat transfer to the system water, lower surface temperature per watt, and extended element life compared with conventional designs.
Serpentine elementHigh heat transferLong element life
Touchscreen Control Display — Simple On-Site Commissioning
The boiler features a touchscreen control panel with backlit display. Flow temperature is adjustable from 20°C to 80°C in 1°C steps. The display shows current flow temperature, set-point, fault codes and system pressure at a glance. No separate programmer is included — the boiler integrates with standard wiring centres, room thermostats and zone valves.
Touchscreen20–80°C rangeFault code display
No Flue, No Gas, No Carbon Monoxide — Safe for Any Location
As a fully electric system, the Strom boiler requires no flue, no gas supply and produces no carbon monoxide. It can be sited in cupboards, utility rooms or any location where a gas or oil boiler would not be permitted or practical. Ideal for off-grid properties, flats, conversions and commercial premises without a mains gas connection.
No flue neededNo gas supplyZero CO outputOff-grid ready
Solar Panel Compatible — Reduce Running Costs with PV
The boiler is compatible with solar PV panels via an appropriate solar diverter (such as Solar iBoost+ or myenergi eddi). Surplus solar generation can be diverted to heat the cylinder immersion, substantially reducing electricity running costs. The pre-plumbed cylinder includes a single immersion heater boss for direct electric top-up.
Solar PV compatibleImmersion boss includedDiverter-ready
Heating Pressure Range: 0.5–1.5 Bar — Standard Sealed System
The boiler operates within a 0.5 to 1.5 bar sealed heating circuit pressure range. The pre-fitted expansion vessel accommodates normal system expansion. A pressure relief valve and filling loop are included. System pressure is displayed on the touchscreen — no separate pressure gauge dial to read.
0.5–1.5 bar working pressurePRV + filling loop includedExpansion vessel pre-fitted
Qualified Installation Required — G3 Competent Person + Qualified Electrician
The cylinder is unvented (pressurised) and must be installed by a G3 Unvented Competent Person in accordance with Building Regulations Part G. The boiler wiring must be carried out by a qualified electrician to BS 7671. Strom recommend a dedicated RCD-protected circuit for the boiler. Boiler warranty requires registration within 45 days of purchase at stromltd.com.
G3 competent personQualified electricianRegister within 45 days
Technical Specifications
| Boiler | |
| Heat Output | 9kW |
| Power Supply | 230V, single phase |
| Current Draw | 41A |
| Minimum Breaker Size | 50A |
| Minimum Cable Size | 6 mm² |
| Heating Temperature Range | 20°C – 80°C |
| Heating Pressure Range | 0.5 – 1.5 bar |
| Flow & Return Connection | ¾" male (flexi hoses or push-fit recommended) |
| PRV Connection | 15mm compression |
| Boiler Dimensions (H×W×D) | 520 × 235 × 120 mm |
| Controls | Touchscreen with display |
| ERP Rating (Heating) | D |
| Cylinder | |
| Cylinder Type | Pre-plumbed indirect unvented (Prime2o) |
| Nominal Capacity | 150L |
| Actual Capacity | 147 litres |
| Cylinder Material | Duplex stainless steel |
| Insulation | 50mm PU foam |
| Weight Empty | 48 kg |
| Weight Full | 196 kg |
| Heat Loss | 1.32 kWh/24h |
| Coil Rating | 19.94 kW |
| Max Water Pressure | 10 bar |
| Max Fill Pressure | 3 bar |
| Number of Immersions | 1 |
| Cylinder Dimensions (H×W×D) | 1075 × 580 × 660 mm |
| ERP Rating (Cylinder Only) | C |
| Compatibility & Warranty | |
| Heating Type | Heat-only (regular boiler) — requires separate system controls (programmer, room stat, zone valves) |
| Solar PV Compatible | Yes — via solar diverter to immersion |
| SKU / Part Number | SBSP9H150PP |
| Boiler Warranty | 2 years (registration within 45 days at stromltd.com) |
| Cylinder Guarantee | 25-year manufacturing guarantee |
| Manufacturer | Strom Ltd, UK |
Frequently Asked Questions
Related Products
Strom Electric Heat-Only Boiler (Boiler Only)
Boiler-only option for pairing with existing cylinder
Strom Prime2o Unvented Cylinder (Cylinder Only)
Standalone cylinder for pairing with existing boiler
Solar iBoost+ Solar Diverter
Divert surplus PV to heat the cylinder immersion
myenergi eddi PV Diverter
Intelligent solar diverter compatible with this installation
