GRANT ENGINEERING (UK) LTD, HOPTON HOUSE, HOPTON INDUSTRIAL ESTATE, DEVIZES, WILTSHIRE SN10 2EUTELEPHONE 0870 7775553 FAX 0870 7775559 E-mail: sales@grantuk.com Website: www.grantuk.com

S P E C I F I C AT I O N S

EZ FITFLUE SYSTEM

GRANT

PERFORMANCE

Output to heating, or hot waterCombi 70 MkII 50-70,000 Btu/h (15-20kW)Combi 90 MkII &Outdoor Combi 90 MkII 70-90,000 Btu/h (20-26kW)

GENERAL

Burner Riello RDBSet for kerosine Class C2

Electricity supply 230V 50Hz Fused at 5 Amp

Flue size (conventional) 100mm (4”) diaWater contentCombi 70 MkII 80 litres (17.6gals)Combi 90 MkII 40 litres (8.8gals)Weight (dry)Combi 70 MkII 158kg (348lbs)Combi 90 MkII 158kg (348lbs)Max hearth temp Less than 50°C

PIPE CONNECTION SIZES

Heating return 1” BSP femaleHeating flow 22mm dia copper pipeCold water inlet 15mm dia copper pipeHot water outlet 15mm dia copper pipe

Pressure reliefvalve discharge 15mm dia copper pipe

SEALED HEATING SYSTEM

Boiler thermostat range 75 to 85°CLimit thermostat temp 111°CMax operating pressure 2.5 barMax system pressure (cold) 1.5 barMin system pressure (cold) 0.5 barExpansion vessel capacity 12 litres

EASY TO SERVICE ANDMAINTAIN

Grant Combi boilers are easy tomaintain, with the Combi 90 MkII onlyrequiring front access for routineservicing, reducing servicing time.

Both boilers incorporate Riello RDBpressure jet burners set to the statedoutput, for use on standard gradekerosine – Class C2. The burners can bereset on installation to operate on ClassD gas oil, but only for conventional flueapplications.

DOMESTIC HOT WATER

FlowrateCombi 70 MkII Domestic hot water fitted & Combi 90 MkII with restrictor set at

17 litres per minute.(flow rate is dependant on mains pressure available)Typical hot water performance@15 litres per minuteCombi 70 MkII 33 gals (150 litres) at an average temperature of 45°C.Combi 90 MkII & Outdoor Combi 90 MkII33 gals (150 litres) at an averagetemperature of 48°C.RecoveryTypical recovery times between hot water draw offs (in hot water mode)Combi 70 MkII: 8 minutes approxCombi 90 MkII: 4 minutes approxMains water pressureMinimum 1.5 bar (22 psi)Maximum 10 bar (145 psi)

INSTALLATION

Installation must comply with thecurrent British Standards and BuildingRegulations. Comprehensive technicalinformation can be found in theinstallation manual which is supplied withevery boiler.

GUARANTEES

The unique boiler heat exchangers ofGrant Combi’s are covered by a 5-yearguarantee. All other component parts ofthe boiler are guaranteed for 2 yearsfrom the date of purchase, subject tobeing installed in accordance with themanufacturers instructions. There is alsoan optional 3-year extended warrantyscheme available. On completion of theinstallation all Grant Combi boilers shouldbe commissioned and the guaranteeregistration form returned to Grant UK.

AFTER SALES SERVICE

For peace of mind, all Grant boilers arebacked by a national network ofindependent service engineers. In theunlikely event of a problem occurring,your installer should telephone ourCustomer Service Department on0870 7775553.

The Combi 70MkII & Combi 90MkII dimensions

The Outdoor Combi 90MkII dimensions

In accordance with our policy of continual improvement, wereserve the right to amend specifications without prior notice.Manufactured under I.S. EN ISO 9001.Approved to OFS A100 (EN303 part 4). Complies with the ECLow Voltage and Electromagnetic Compatibility and BoilerEfficiency Directives.

Euroflame & Multi Pass are Registered Trade Marks of GrantEngineering Limited.SEDBUK stands for ‘Seasonal Efficiency of Domestic Boilers inthe UK’. *Combi’s are capped at 82.9% and 82.5% Gross.

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COMBI 70 MkII HEAT EXCHANGER

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High efficiency (93% - 95% nett)SEDBUK ‘C’ 82.5 - 82.9% Gross*

Whisper quiet in operation

Three models available:Combi 70 MkII, Combi 90 MkII andOutdoor Module Combi 90 MkII

Front access for ease of servicing(Combi 90 only)

Reversible hinged front door

Models include all components forsealed heating system

Mains pressure hot water on demand

High domestic hot water flow rates

Rapid recovery of heat store after hotwater operation

Now available with the new low level, high level and vertical EZ-FIT flue System

Fully approved to OFTEC Standardsand complies with EC Directives

Combi 70 MKIICombi 90 MKIIOutdoor Module Combi 90 MKII

COMBIRANGE

EXCEPTIONALLY HIGHPERFORMANCE – PRIMARY STORECOMBI’S FOR SMALL TO MEDIUMSIZED HOMES

GRANT COMBI O IL BOILER RANGE

EZ FITFLUE SYSTEM

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INSTANT HOT WATER ATMAINS PRESSURE

A Grant Combi boiler provides bothcentral heating and hot water at mainspressure. Factory set to 70,000 Btu/h(Euroflame Combi 70 MkII) and 90,000Btu/h (Multi Pass Combi 90 MkII), theyare designed for use on a sealed heatingsystem, with all the necessarycomponents housed within the compactand elegant white casing.

Using the primary water stored in theboiler, for rapid response to a demand forhot water, and with quick recovery afterhot water operation, the Grant Combican provide ample amounts of hot waterinstantly, whenever required, night andday. A factory-set thermostaticblending valve ensures a stablecontrol of the hot watertemperature, minimising fluctuationscaused by other taps being turnedon!

Grant Combi boilers are designedto be installed beneath standardheight kitchen worktops. The Combi 90MkII only requires access from the frontfor routine servicing, whereas the Combi70 MkII needs a removable section ofworktop for service access andmaintenance operations.

All pipe connections are at the rear ofthe boiler, passing to either left or rightdepending on the type of flue systemused. The Combi 70 MkII is based on theEuroflame 50/70 and the Combi 90 MkIIbased on the Multi Pass 70/90, bothcomply with the OFTEC Standard OFSA100 (EN303 Part 4), and are the idealchoice for the replacement of oldappliances, leading the way in the energyefficient provision of central heating andhot water in small to medium sizedhomes.

UNIQUEOUTDOORMODULE COMBI

For properties where siting acombination boiler is difficult, Grant havedeveloped a unique outdoor version of thepopular Combi 90 MkII, details of whichare available on a separate outdoormodule brochure from Grant (UK).

GREATER EFFICIENCY

Both the Grant Multi Pass and EuroflameCombi boilers meet the requirements ofthe new European Boiler EfficiencyRegulations with a highly efficient heatexchange operation, achieving around93–95% nett thermal efficiency onheating.

Their advanced heat exchanger designforces the hot gases through thepatented baffle system for a distance ofup to 8.5 feet (2.6 metres) on the Combi70 MkII and 22 feet (6.8 metres) on theCombi 90 MkII, holding them in contactwith the boiler surface area for longer.This process vastly increases theamount of heat transferred to the waterjacket, enabling the boiler to operatecontinually at much higher efficiencies.

EZ-FIT FLUE

Grant Combi’s are designed to be usedwith a 100mm [4”] diameterconventional flue, however, they can alsobe installed with Grant’s new ‘EZ-FIT’multi-directional low level balanced fluekits, which with the new self-sealingducts, vastly cut down on installationtime. The new kit incorporates anextremely small stainless steel terminalguard, is designed to be less obtrusiveand can be installed using a core drill.High level and vertical EZ-Fit balancedflue kits and optional 450 and 900 elbowsare also available. Balanced flue boilersdiffer from conventional flue appliances inthat air for combustion is drawn fromoutside, via the balanced flue terminal,rather than from the internal space. Theuse of a balanced flue kit enablesinstallation through any suitable outsidewall, providing greater flexibility when

siting the boiler. For full details of all flueoptions please consult Grant’s latestRetail Price List or ask for ourcomprehensive flue guide.

THE ADDED BENEFITS OFGRANT BALANCED FLUEBOILERS

At Grant, we have developed an externalbalanced flue terminal that overcomesthe adverse effects of strong winds.Another important feature is a sealedburner, making Grant balanced flueboilers exceptionally quiet in the kitchenenvironment.

ENJOYING THE TWIN BENEFITS

An oil combination boiler provides thebenefits of highly efficient oilcentral heating, combined withinstant hot water.

The savings are considerable -- incost and space. You save space becauseunlike a conventional system there is noneed for a hot water cylinder in theairing cupboard, or cold water headertank in the loft (not forgetting all theextra pipework!). So you save money asthere is no need to pay to store hotwater.

Furthermore, you will never have towait for a 30-gallon cylinder to heat upbecause you’ve run out of hot water! Youcan have bath after bath, time aftertime. And, of course, because a combiprovides hot water direct from the coldmains, you’ll enjoy powerful, invigoratingshowers.

TRADITIONAL SYSTEM

GRANT COMBI SYSTEM

The Grant Round EZ-Fit low level balanced flue system is compatible with all Grant boilers, can be extended up to 2 metres andincorporate 450 or 900 elbows.

45o elbows can be used with high leveland vertical kits to offset the flue.

Stainless steel terminal guardand external cover trim [supplied with every Roundlow level flue kit]

165mm

255mm

200mm

High levelbalanced Flue Kits are available(maximum run 4 metres).

Vertical balanced Flue Kits are availablefor heights up to 6 metres above the boiler.

Combi 70 MkII[with new pipework cover removed]

System pressure gauge

Blending valve

Boiler thermostat & overheat thermostat

Primary store thermostat

Grundfoss 15-60 circulating pump

Pump isolating valve

Flow switch

Domestic hot water heat exchanger

Mains cold water supply valve

Filling loop isolating valve

Primary return isolating valve

Riello RDB Burner

Flexible filling loop

Boiler drain cock

Expansion vessel

Combi 90 MkII[with new pipework cover removed]

System pressure gauge

Blending valve

Boiler thermostat & overheat thermostat

Primary store thermostat

Grundfoss 15-60 circulating pump

Pump isolating valve

Flow switch

Domestic hot water heat exchanger

Mains cold water supply valve

Filling loop isolating valve

Primary return isolating valve

Riello RDB Burner

Flexible filling loop

Boiler drain cock

Expansion vessel

Plug-in timers(optional)

Remote Timer Kit(optional)

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