Advice on what power combi?

[TAG77]

Planning to install a new combi into my small three bed semi. One bathroom two kids and so the washer is on most of the time. In addition to this we have a thermostatic shower unit which we use in preference to baths. Have priced up three combis : 24w 30w and 35w obviously with differing flow rates. Any views which unit will be up to the job? The property is new build so consequently small rooms and double glazed throughout.

 

[Rob]

Whats your flow rate of water? No point fitting a combi capable of heating 15ltr per min and only feed it with 10 lpm.

 

[jackpike]

i'd go the 30w, the washer won't use hot water, it will more than handle the heating and give 12 ltres per min, which is well good for a shower, a 35 will give 13 litres but still only do one tap at a time, so is it worth the extra £150, ? not in my opinion,

 

[TAG77]

Whats your flow rate of water? No point fitting a combi capable of heating 15ltr per min and only feed it with 10 lpm.

Will need to check our flow rate thanks for that.

 

[TAG77]

thanks for that will check our flow rate at the house and then make my decision.

 

[compheat]

Intergas 36/30HRE combi flow rate 16L per min

 

[Happyplumber]

Check your flow rate and pressure then you have myriad of combination boilers to choose from a 24 kw is too measly for proper shower in my opinion and usaully reserved for landlord boilers

A 28KW is the bare minimum and then you have to decide wether you want bog standard combi or storage type unit some which can quite easily do 18 litres pm ,again all dependent on flow rate

 

[Boilerman2]

As has been said check your flow rate, then pick the combi that can easily heat that amount of water i.e you have 12L/min, choose a boiler that will heat 15L/min, if you only have 10L/minthen a boiler that will heat 12L/min will do, this is to ensure that in winter when the cold water inlet temperature is way down low, the boiler will still supply good HW.

My water main delivers 14L/min, so I fitted a 35Kw Combi which can heat 16L/min, even in winter I have good Temperature and flow, without wasting energy.