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Sunamp A2057 Heat Battery Protection Kit – PRV, TMV, Expansion Vessel, For Thermino ePlus and xPlus
Sunamp A2057 Heat Battery Protection Kit – PRV, TMV, Expansion Vessel, For Thermino ePlus and xPlus
The Sunamp A2057 Heat Battery Protection Kit is the official Sunamp installation accessory kit for Thermino ePlus and xPlus heat batteries. It contains every hydraulic component required for a safe, compliant installation: inlet control group (pressure reducing valve, non-return valve and expansion relief valve), thermostatic mixing valve (TMV — C5388) for scald prevention at the hot water outlet, 2.0L expansion vessel for thermal expansion management, and an isolation valve. Using Sunamp-approved components ensures the installation meets UK Building Regulations, protects the warranty and avoids last-minute sourcing of individual fittings. Compatible with all ePlus (70–300) and xPlus (150–300) models.
PRV
Pressure Reducing Valve
TMV
Scald Prevention
2.0L
Expansion Vessel
NRV
Non-Return Valve
ERV
Expansion Relief
Official
A2057 Kit
Key Features
Complete Hydraulic Protection in One Kit
The A2057 Heat Battery Protection Kit contains every mandatory and recommended hydraulic component for a compliant Thermino ePlus or xPlus installation: inlet control group (PRV, non-return valve, expansion relief valve), thermostatic mixing valve (TMV, C5388), 2.0L expansion vessel and isolation valve. Buying as a kit is more cost-effective than sourcing each component individually and ensures all components are matched and Sunamp-approved.
PRV + NRV + ERVTMV C53882.0L expansion vesselIsolation valve
Inlet Control Group — Pressure, Backflow and Expansion Management
The inlet control group manages the three primary hydraulic risks at the cold-water inlet: pressure reducing valve (PRV) — limits incoming pressure to the recommended 3 bar set point; non-return valve (NRV) — prevents backflow of hot water into the cold mains; expansion relief valve (ERV) — safely vents excess pressure caused by thermal expansion of water in the system.
Pressure reducing valveNon-return valveExpansion relief valve
Thermostatic Mixing Valve (C5388) — Scald Prevention
The TMV (C5388) is fitted at the hot water outlet of the heat battery and blends the stored high-temperature water with cold mains water to a safe, consistent output temperature. Setting: 45–55°C as required by UK Building Regulations. Without a TMV at the outlet, the stored water — heated above 60°C — can cause severe scalding instantly.
TMV C538845–55°C outputScald prevention — required by law
2.0L Expansion Vessel — Thermal Expansion Control
As stored water heats, it expands. The 2.0L expansion vessel accommodates this thermal expansion within the system, preventing pressure build-up that would otherwise cause repeated activation of the relief valve and wasted water. Correctly sized for Thermino ePlus and xPlus installations.
2.0L expansion vesselMatched to Thermino range
Sunamp-Approved Kit — Compatible with All Thermino ePlus and xPlus Models
This is the official Sunamp accessory kit referenced in the Thermino installation manual (part number A2057). Compatible with all ePlus models (70, 150, 210, 300) and all xPlus models (150, 210, 300). Using Sunamp-approved components protects the warranty and ensures the system behaves as intended.
Official Sunamp A2057All ePlus modelsAll xPlus models
Technical Specifications
| Kit Contents — A2057 Heat Battery Protection Kit | |
| Inlet Control Group | 1× (includes PRV, non-return valve and expansion relief valve) |
| Thermostatic Mixing Valve | 1× Sunamp C5388 TMV |
| Expansion Vessel | 1× 2.0L |
| Isolation Valve | 1× included |
| Compatibility | |
| Compatible Products | All Thermino ePlus (70, 150, 210, 300) and xPlus (150, 210, 300) models |
| Part Number | A2057 |
| Installation Note | |
| TMV Setting | 45–55°C (required by UK Building Regulations) |
| PRV Set Point | 3 bar (recommended Sunamp operating pressure) |
| Installer Requirement | Must be installed by a qualified and competent person |
ℹ Installation: Must be installed by a qualified and competent person (plumber and electrician) in accordance with the Sunamp Thermino installation manual and UK Building Regulations.
Frequently Asked Questions
Related Products
Sunamp Thermino ePlus Heat Battery
Direct electric heat battery — all sizes
Sunamp Thermino xPlus Heat Battery
Indirect heat battery — boiler and heat pump
Sunamp Water Conditioner (C5381)
For hard water areas (>150 ppm)
$92.12
Original: $263.19
-65%Sunamp A2057 Heat Battery Protection Kit – PRV, TMV, Expansion Vessel, For Thermino ePlus and xPlus—
$263.19
$92.12Sunamp A2057 Heat Battery Protection Kit – PRV, TMV, Expansion Vessel, For Thermino ePlus and xPlus
The Sunamp A2057 Heat Battery Protection Kit is the official Sunamp installation accessory kit for Thermino ePlus and xPlus heat batteries. It contains every hydraulic component required for a safe, compliant installation: inlet control group (pressure reducing valve, non-return valve and expansion relief valve), thermostatic mixing valve (TMV — C5388) for scald prevention at the hot water outlet, 2.0L expansion vessel for thermal expansion management, and an isolation valve. Using Sunamp-approved components ensures the installation meets UK Building Regulations, protects the warranty and avoids last-minute sourcing of individual fittings. Compatible with all ePlus (70–300) and xPlus (150–300) models.
PRV
Pressure Reducing Valve
TMV
Scald Prevention
2.0L
Expansion Vessel
NRV
Non-Return Valve
ERV
Expansion Relief
Official
A2057 Kit
Key Features
Complete Hydraulic Protection in One Kit
The A2057 Heat Battery Protection Kit contains every mandatory and recommended hydraulic component for a compliant Thermino ePlus or xPlus installation: inlet control group (PRV, non-return valve, expansion relief valve), thermostatic mixing valve (TMV, C5388), 2.0L expansion vessel and isolation valve. Buying as a kit is more cost-effective than sourcing each component individually and ensures all components are matched and Sunamp-approved.
PRV + NRV + ERVTMV C53882.0L expansion vesselIsolation valve
Inlet Control Group — Pressure, Backflow and Expansion Management
The inlet control group manages the three primary hydraulic risks at the cold-water inlet: pressure reducing valve (PRV) — limits incoming pressure to the recommended 3 bar set point; non-return valve (NRV) — prevents backflow of hot water into the cold mains; expansion relief valve (ERV) — safely vents excess pressure caused by thermal expansion of water in the system.
Pressure reducing valveNon-return valveExpansion relief valve
Thermostatic Mixing Valve (C5388) — Scald Prevention
The TMV (C5388) is fitted at the hot water outlet of the heat battery and blends the stored high-temperature water with cold mains water to a safe, consistent output temperature. Setting: 45–55°C as required by UK Building Regulations. Without a TMV at the outlet, the stored water — heated above 60°C — can cause severe scalding instantly.
TMV C538845–55°C outputScald prevention — required by law
2.0L Expansion Vessel — Thermal Expansion Control
As stored water heats, it expands. The 2.0L expansion vessel accommodates this thermal expansion within the system, preventing pressure build-up that would otherwise cause repeated activation of the relief valve and wasted water. Correctly sized for Thermino ePlus and xPlus installations.
2.0L expansion vesselMatched to Thermino range
Sunamp-Approved Kit — Compatible with All Thermino ePlus and xPlus Models
This is the official Sunamp accessory kit referenced in the Thermino installation manual (part number A2057). Compatible with all ePlus models (70, 150, 210, 300) and all xPlus models (150, 210, 300). Using Sunamp-approved components protects the warranty and ensures the system behaves as intended.
Official Sunamp A2057All ePlus modelsAll xPlus models
Technical Specifications
| Kit Contents — A2057 Heat Battery Protection Kit | |
| Inlet Control Group | 1× (includes PRV, non-return valve and expansion relief valve) |
| Thermostatic Mixing Valve | 1× Sunamp C5388 TMV |
| Expansion Vessel | 1× 2.0L |
| Isolation Valve | 1× included |
| Compatibility | |
| Compatible Products | All Thermino ePlus (70, 150, 210, 300) and xPlus (150, 210, 300) models |
| Part Number | A2057 |
| Installation Note | |
| TMV Setting | 45–55°C (required by UK Building Regulations) |
| PRV Set Point | 3 bar (recommended Sunamp operating pressure) |
| Installer Requirement | Must be installed by a qualified and competent person |
ℹ Installation: Must be installed by a qualified and competent person (plumber and electrician) in accordance with the Sunamp Thermino installation manual and UK Building Regulations.
Frequently Asked Questions
Related Products
Sunamp Thermino ePlus Heat Battery
Direct electric heat battery — all sizes
Sunamp Thermino xPlus Heat Battery
Indirect heat battery — boiler and heat pump
Sunamp Water Conditioner (C5381)
For hard water areas (>150 ppm)
Product Information
Product Information
Shipping & Returns
Shipping & Returns
Description
The Sunamp A2057 Heat Battery Protection Kit is the official Sunamp installation accessory kit for Thermino ePlus and xPlus heat batteries. It contains every hydraulic component required for a safe, compliant installation: inlet control group (pressure reducing valve, non-return valve and expansion relief valve), thermostatic mixing valve (TMV — C5388) for scald prevention at the hot water outlet, 2.0L expansion vessel for thermal expansion management, and an isolation valve. Using Sunamp-approved components ensures the installation meets UK Building Regulations, protects the warranty and avoids last-minute sourcing of individual fittings. Compatible with all ePlus (70–300) and xPlus (150–300) models.
PRV
Pressure Reducing Valve
TMV
Scald Prevention
2.0L
Expansion Vessel
NRV
Non-Return Valve
ERV
Expansion Relief
Official
A2057 Kit
Key Features
Complete Hydraulic Protection in One Kit
The A2057 Heat Battery Protection Kit contains every mandatory and recommended hydraulic component for a compliant Thermino ePlus or xPlus installation: inlet control group (PRV, non-return valve, expansion relief valve), thermostatic mixing valve (TMV, C5388), 2.0L expansion vessel and isolation valve. Buying as a kit is more cost-effective than sourcing each component individually and ensures all components are matched and Sunamp-approved.
PRV + NRV + ERVTMV C53882.0L expansion vesselIsolation valve
Inlet Control Group — Pressure, Backflow and Expansion Management
The inlet control group manages the three primary hydraulic risks at the cold-water inlet: pressure reducing valve (PRV) — limits incoming pressure to the recommended 3 bar set point; non-return valve (NRV) — prevents backflow of hot water into the cold mains; expansion relief valve (ERV) — safely vents excess pressure caused by thermal expansion of water in the system.
Pressure reducing valveNon-return valveExpansion relief valve
Thermostatic Mixing Valve (C5388) — Scald Prevention
The TMV (C5388) is fitted at the hot water outlet of the heat battery and blends the stored high-temperature water with cold mains water to a safe, consistent output temperature. Setting: 45–55°C as required by UK Building Regulations. Without a TMV at the outlet, the stored water — heated above 60°C — can cause severe scalding instantly.
TMV C538845–55°C outputScald prevention — required by law
2.0L Expansion Vessel — Thermal Expansion Control
As stored water heats, it expands. The 2.0L expansion vessel accommodates this thermal expansion within the system, preventing pressure build-up that would otherwise cause repeated activation of the relief valve and wasted water. Correctly sized for Thermino ePlus and xPlus installations.
2.0L expansion vesselMatched to Thermino range
Sunamp-Approved Kit — Compatible with All Thermino ePlus and xPlus Models
This is the official Sunamp accessory kit referenced in the Thermino installation manual (part number A2057). Compatible with all ePlus models (70, 150, 210, 300) and all xPlus models (150, 210, 300). Using Sunamp-approved components protects the warranty and ensures the system behaves as intended.
Official Sunamp A2057All ePlus modelsAll xPlus models
Technical Specifications
| Kit Contents — A2057 Heat Battery Protection Kit | |
| Inlet Control Group | 1× (includes PRV, non-return valve and expansion relief valve) |
| Thermostatic Mixing Valve | 1× Sunamp C5388 TMV |
| Expansion Vessel | 1× 2.0L |
| Isolation Valve | 1× included |
| Compatibility | |
| Compatible Products | All Thermino ePlus (70, 150, 210, 300) and xPlus (150, 210, 300) models |
| Part Number | A2057 |
| Installation Note | |
| TMV Setting | 45–55°C (required by UK Building Regulations) |
| PRV Set Point | 3 bar (recommended Sunamp operating pressure) |
| Installer Requirement | Must be installed by a qualified and competent person |
ℹ Installation: Must be installed by a qualified and competent person (plumber and electrician) in accordance with the Sunamp Thermino installation manual and UK Building Regulations.
Frequently Asked Questions
Related Products
Sunamp Thermino ePlus Heat Battery
Direct electric heat battery — all sizes
Sunamp Thermino xPlus Heat Battery
Indirect heat battery — boiler and heat pump
Sunamp Water Conditioner (C5381)
For hard water areas (>150 ppm)
