Read the information document regarding the minimum two-year legal warranty provided in the European Union.
LK ARMATUR - Thermostatic Mixer 3/4'' LK 551 HydroMix | 35–65 °C | Fittings and Check Valves
LK ARMATUR - Thermostatic Mixer 3/4'' LK 551 HydroMix | 35–65 °C | Fittings and Check Valves is backordered and will ship as soon as it is back in stock.
Description
Description
LK 551 HydroMix: water temperature under control
The LK ARMATUR LK 551 HydroMix 3/4'' thermostatic mixer mixes hot and cold water to achieve the desired outlet temperature. The configuration described includes fittings and non-return valves and a setting range of 35–65 °C. It is intended for domestic water and heating systems; in solar thermal systems, compatibility must be verified based on the actual temperatures at the installation point.
- Model: LK 551 HydroMix
- Declared size: 3/4''
- Mixed water setting: 35–65 °C
- Contents: fittings and non-return valves
- Anti-scald function: hot water flow shut-off in case of cold water interruption, under the conditions specified by the manufacturer
- Declared maximum pressure: 10 bar
Main features
- Thermostatic control: the thermostatic element regulates the mixing to the set value.
- Asymmetrical valve: the inlets and outlet are identified by the letters C, H and M.
- Control knob: allows you to select the temperature within the specified range.
- Protective cover: helps prevent accidental changes to the setting.
- Non-return valves: included in the configuration along with the fittings.
- Installation check: periodic checks of correct operation are recommended.
Technical data
| Brand | LK ARMATUR |
| Model | LK 551 HydroMix |
| SKU | 181454 |
| Barcode present in catalog | 092053, type not specified |
| Declared nominal size | 3/4''; check the geometry and threads of the provided configuration |
| Mixed water setting | 35–65 °C, according to the configuration description |
| Maximum operating pressure | 1.0 MPa / 10 bar |
| Declared temperature stability | ±3 °C |
| Inlets / outlet | C: cold water; H: hot water; M: mixed water |
| Operating temperature range | Minimum 5 °C; maximum 65 °C or 95 °C depending on the version. Check the limit of the specific configuration before installation. |
Materials and range compatibility
| Valve body | The range documentation reported in the catalog indicates EN 12165 CW617N brass or DZR EN 12165 CW625N brass, depending on the version. |
| Fluids indicated for the range | Water; water-glycol up to 50%; water-ethanol up to 30%. Check the compatibility and intended use of the specific version; the mixtures are not domestic water. |
| Threads indicated for the range | Rp female / G male according to the configuration, not a declaration of the presence of both on this kit. |
Contents
- LK 551 HydroMix thermostatic mixer
- Connection fittings and non-return valves, according to the configuration described in the catalog.
Applications
- Domestic water: mixed water temperature regulation according to the system requirements.
- Heating systems: mixing in circuits compatible with the installed version.
- Solar thermal: use at the point of the system compatible with the valve limits; do not assume suitability for the primary circuit or stagnation temperatures.
Official documentation
LK 551 HydroMix manufacturer page and range documentation
Product video
Frequently Asked Questions (FAQ)
Q: What is the setting range?
A: For the configuration described in the catalog, it is 35–65 °C. Do not confuse this range with the maximum allowed inlet temperature.
Q: Are fittings and non-return valves included?
A: Yes, the configuration is described with connection fittings and non-return valves.
Q: What do C, H and M indicate?
A: C is the cold inlet, H is the hot inlet and M is the mixed water outlet. Also follow the arrow on the body.
Q: Is it suitable for any solar thermal system?
A: No, the installer must check the circuit of use and the limits of the specific version. The range data report different maximum temperatures and materials.
LK ARMATUR - LK 551 HydroMix 3/4'' Thermostatic Mixer | 35–65 °C | Fittings and Non-Return Valves
LK ARMATUR: solutions for the regulation of hydronic systems.
Security Information
Security Information
Data about the Person Responsible for the Product: Tecno Sales Agency srl Via Linguetta, 10C - 60027 Osimo (AN) - ITALY
Contact Person Responsible for the Product: Tel. +39 071.7223426
Product Safety Document:
Warranty
Warranty
.
At BricoHome, we are committed to offering you high-quality products, aware that your peace of mind goes beyond a simple transaction. To ensure your complete satisfaction, we have implemented a robust warranty policy, demonstrating our commitment to quality and reliability.
In this section you will find information about our product warranty. We want you to be well-informed and confident in your choice, so we invite you to carefully read the warranty information. Our goal is to ensure you have a worry-free shopping experience, with the certainty that, if necessary, we are here to support you at all times.
Please contact us for any warranty request:
- Call us at 376 0343302
- Write to us at info@jicomputer.com
- Complete the contact form
Please specify: first and last name, order ID, brand, product, and issue. We will look for the fastest solution for you and contact the brands as necessary.
PRODUCT WARRANTY (STANDARD)
The warranty period is 12 months from the product purchase date for consumers who have an invoice. It is 24 months for those who have a receipt or other proof of purchase.
PRODUCT WARRANTY WITH SEAL
For sealed products (e.g., insecticide), the warranty does not apply once opened. However, if the seal remains intact, you are entitled to a free return within 30 days.
Shipments
Shipments
Shipping Details
Shipments are made via the following couriers

When ordering, you can enter your shipping preferences in the notes section, choosing the desired courier.
Shipping Costs:
- Italy area (except Sardinia)
- Standard shipping (€6.90), FREE for orders over €99
- Priority shipping (€9.90), reduced cost to (€3.90) for orders over €99
- Italy area (Sardinia only)
- Standard shipping (€10.90), FREE for orders over €99
- Eurozone 1 (Austria, Belgium, Croatia, Czechia, Denmark, France, Hungary, Luxembourg, Netherlands, Poland, Slovenia, Spain, Germany)
- Standard shipping (€19.99)
- Eurozone 2 (Romania)
- Standard shipping (€24.95)
Shipping times:
- 24/48 WORKING HOURS FOR NORTHERN AND CENTRAL ITALY;
- 48/72 HOURS FOR SARDINIA AND MINOR ISLANDS;
- 24 WORKING HOURS FOR SOUTHERN ITALY INCLUDING SICILY;
Returns are always guaranteed and FREE, within 30 days of purchase.
Free returns
Free returns
In any case, the consumer buyer has the right to withdraw from the contract without penalty and without specifying the reason within 30 days of receiving the purchased goods . If the withdrawal occurs within this period, we will arrange for the collection of the goods by courier at our expense , without the customer having to take any action. The customer must provide us with a date and time slot of at least 3-4 business hours , so we can schedule the collection at a convenient time.
- Refunds (if applicable)
Once we receive your return, we will carry out all necessary checks, verifying various aspects: such as the presence of the original box, the presence of any accessories or parts included, any damage not present in the original new product, etc. If your request is approved, the refund will be processed and a credit will automatically be applied to your card or original payment method. within 5 working days.
- Changes (if applicable)
We only replace items if they are defective or damaged.
In the event that the Consumer decides to exercise the right of withdrawal within the timeframes indicated above, you must notify the seller of this By email to info@jicomputer.com, or by completing the easy return form by clicking here.
If your return request exceeds 30 days, please provide as many details as possible so we can better assess the situation. Please note that in this case, the customer will be responsible for the return shipping costs.
Tax Deductions
Tax Deductions
A guide to purchasing with tax deductions and reduced VAT on Bricohome
If you're purchasing products for renovations, home improvements, or for specific needs, you may be eligible for significant tax breaks. Find out how to access these benefits and make your purchases even more affordable.
Who is entitled to it?
Tax breaks and reduced VAT are reserved for:
- Private citizens carrying out building renovation or energy efficiency improvement work;
- Condominiums for work on common areas;
- Companies and professionals who carry out specific interventions;
Which products are eligible for the discounts?
Not all products are eligible for tax relief. Generally , tax relief applies to materials and devices used for renovation, energy efficiency, and architectural barrier removal projects. To check the suitability of a specific product , we recommend that you consult the current legislation or contact our customer service.
On Bricohome, the most popular product categories eligible for the discounts include: Electric pumps, Pressure controls, Taps, Thermostats, Control units, Circulators, Intercoms and video intercoms.
Reduced VAT rates
Depending on the type of intervention, different VAT rates apply:
- 4% for the construction or purchase of a first home (if eligible).
- 10% for extraordinary maintenance, restoration, or renovation work.
- 22% for all products not subject to tax relief.
How to apply for the discount on Bricohome
To obtain the reduced VAT, it is necessary to:
-
Place your order on Bricohome by selecting bank transfer as your payment method.
-
Send a request to ......... with the subject line: "Tax deduction request for order ..." (the order number will arrive a few seconds after confirming the order on the website). Specify and provide the following information:
- Name
- Surname
- Address
- Telephone
- Tax ID code
- Type of deduction
- Reference protocol number
- Attach a copy of your identity document
- Attach documents certifying your eligibility to meet the requirements.
-
Please wait for your request to be processed. We will issue an invoice and send you bank transfer instructions within 48 business hours.
-
Make the transfer following the instructions received.
-
Once payment is received, we will proceed with the shipment of the goods.
Doubts or questions?
Write to us at info@jicomputer.com
Call us at +39 376 0343302

