INNOVATING NEW TECHNOLOGY INTO GAS BOILERS
The CSI 120(T) Low Nox has an output from 5kW to 32kW domestic hot water flow rate of 13.2 litres a minute at a 35o rise
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- 90.6% efficiency – SEDBUK Band A rating
- Small and Compact, 700mm High, 40mm Wide and 300mm Deep
- Easy to Install
- 1 Year Guarantee
- Fully Modulating Burner and Fan
- Standard Neat Valve Connections
- Cylindrical Low Nox Heat Exchanger
- Available in Timer and Non-Timer Versions
- Valves more compact and Colour Coded
- Easy Access to All Major Components for Servicing
The CSI 120 Low Nox boiler is a product with extremely low levels of Nox, well below UK standards. We believe this is one of the smallest most competitive boilers on the market. It measures only 700 x 400 x 300mm, offers a high output and not only that, it comes with a 1 year guarantee.

Flue Options

The new CSI 120 Low Nox can be fitted with either a 100mm standard (concentric), a 125mm flue duct or a twin (eccentric) flue duct, which can be installed either vertical or horizontal, depending on the customer’s requirements.
A one metre standard horizontal flue kit is supplied separately; this can extend to 8 metres if required, or 13 metres vertical (maximum without bends). Alternatively, there is a 125mm (concentric) flue system that allows greater flexibility (26 metres). Eccentric flue ducting is ideal for covering long distances and when used with a special Ravenheat connector this can be extended up to 43 metres air intake/exhaust.
See installation manual for all flue options.
Part | Description Flue 60/100 | Part No |
1 | 1 metre horizontal flue kit | PR5023016 |
2 | Straight flue header/Sample Point | PR5094110A |
3 | 1 metre high plume kit | TER110101 |
4 | 1 metre flue extension | PRFE |
5 | 45o in line flue bend | PR45FBI |
6 | 90o in line flue bend | PR90FBI |
7 | Flashing sleeve/plate | TEG060050 |
8 | 1 metre vertical terminal | TER110200 |
9 | Combi ridge terminal kit | TER090100 |
10 | 90o flue exhaust deflection bend | CUR110100 |
11 | 45o flue exhaust deflection bend | CUR110050 |

Easily Installed Neat Connections

Quality Assurance
Ravenheat not only operate a quality ISO9002 system. Indeed we hold the highest accolade in design manufacturing excellence, being one of the new manufacturers to hold ISO9001:2001 system for quality of design, something very few boiler manufacturers have achieved.
This quality system ensures you, the customer, of Ravenheat’s commitment to excellence right across the product range.
*Image for demonstration purposes only.
Boiler Specification
Model | CSI 120 Low Nox (T) | ||
Central Heating Max-Min Nett | |||
Output Max-Min Adjustable | Condensing Mode | kW | 28.8 - 5.7 |
Domestic Hot Water | |||
Output Max-Min Adjustable | Condensing Mode | kW | 32.2 - 5.0 |
Domestic Hot Water | |||
Flow Rate Raised | 30oC | I/Min | 15.4 |
6oC Inlet Temperature | 35oC | I/Min | 13.2 |
Max Net Efficiency | 115% | ||
Expansion Vessel | 1 | 8/1 | |
Maximum Central Heating Temperature | oC | 80o | |
Connection | |||
Heating Flow & Return Compression | mm | 22 | |
Gas Connection Compression | mm | 15 | |
Domestic Supply (Cold) Compression | mm | 15 | |
Domestic Supply (Hot) Compression | mm | 15 | |
Condensing Pipe ¾ Push Fit Overflow Pipe | |||
Flue Size | mm | 100 | |
Electrical Mains Supply | 230v 50Hz Fused 3amp | ||
Nat Gas Band A LPG | % % | 90.6 92.6 | |
Nox Class (Lowest Possible Level) | 5 |

CONDITIONS OF 1 YEAR WARRANTY
Boiler must be correctly installed. Boiler must be commissioned by a Gas Safe Registered Engineer. boiler must be registered with Ravenheat upon purchase (so 1 year warranty can be activated). For any other information please refer to the user guide and installation instructions. For more information on warranties please view our Warranty Terms & Conditions.
Optional External Controls

RHVT 1 Wired-In Receiver
The RHVT 1 wireless 7 day programmable room timer/thermostat compliment our boiler range. Easy to install, it has 7 day programmable settings and a digital display. It will enhance any domestic gas boiler through controlling the temperature more economically.
The RHVT 1 is for installation of the receiver close to the boiler and comes with a built in manual override and an LED display.
It is available from your local plumbing and heating merchant. Email us at [email protected] for details.
Visit the webpage for this product or additionally download the product brochure.

RHVT 2 Plug-In Receiver
The RHVT 2 wireless 7 day programmable room timer/thermostat compliment our boiler range. Easy to install, it has 7 day programmable settings and a digital display. It will enhance any domestic gas boiler through controlling the temperature more economically.
The RHVT 2 easily integrates into almost any manufacturers’ combi boiler and is the same size as a standard boiler time clock and comes with a built in manual override and an LED display.
It is available from your local plumbing and heating merchant. Email us at [email protected] for details.
Visit the webpage for this product or additionally download the product brochure.
Technical After-Sales Service
Ravenheat has a technical helpline at its central headquarters in Leeds. Service engineers and their customers have the satisfaction of knowing they will receive advice, and the knowledge that one of Ravenheat’s own technicians is on hand should an on-site visit be required.
Ravenheat only use their own highly qualified technicians thereby ensuring the highest quality and most reliable customer care.
