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It's under warranty isn't it, any boiler can go wrong? The price is the same as other similar boilers, why did you pay extra?

You can argue that the LLH is to ensure pumps do not conflict but actually it's main purpose is to ensure the boiler heat exchanger always has the correct flow rate across it no matter how the system flow rates changed. Highly restrictive heat exchangers such as those mentioned with low residual...

Glad you used the phrase ball park, there's usually a discrepancy which you can work around and adjust if it is consistant. The trouble comes when manufacturers change weather station contracts.

Perhaps not a representative sample

Get a gas tightness test. How many people in the house, water usage, corner baths, long showers? 40kW sounds ridiculous but even so, say the house loss is in reality 20kW, the house cannot absorb 40 so the boiler will be cycling a lot, you say yours is not. Can the boiler be range rated...

The boiler's not a bit of a dog then, the installers seem to be. When their pipework is sorted put the boiler in preheat mode to get water to the tap faster but there is a cost implication to that.

If you can get to the pipework beneath the floor run shower supplies up the other side of the wall or from somewhere to a hanging shower head above the bath and use a remote shower control, there are even voice activated models. If the existing curtain and rail doesn't completely enclose the...

Start from around the middle then on the coldest day you experience, if you find you are not comfortable enough, increase the setpoint incrementally until the radiators, if they are you heat emitters, supply enough heat. Waste of time giving temperatures as you have no reference on the boiler.

What's on the other side of the wall?

If you're going to get this involved do it right. As mentioned on first page, www.heat-engineer.com. spend £10 +VAT, best part of a day learning and using it then you know where you're starting from. I reckon much of the existing will be ok. Rad sizes, new and existing and options are easy...

Simple solution keep cylinder (do you have an immersion heater for backup?). New boiler, keep pump for hot water in shower then everything else except kitchen cold is at same pressure and gravity is your friend (if that goes you'll have more pressing issues to deal with) Minimum pipework...

If someone wants a house they'll want it. They'll always look for reasons why they should get it cheaper but it's just part of the game. Do you look for a four bed house, must have hot water tank in not combi? The OP is going to live life there for himself and his wife, not for people he...

The boiler should suit the user not the house in my opinion but if you go the combi route think about proximity of DHW to outlets to source. Also think about the implications of reusing old gravity domestic pipework on a combi, it’ll be too large a bore leading to wastage and delay. If cylinder...

From your other posts I know you realise that there are many aspects to the combustion process so it is correct in one respect that the surface of heat exchanger can increase the possibility of improved transfer also increases, however not so sure about NoX as that's flame temperature not...

There is a saving with a modulating boiler but it's just one of many little improvements in the thing that actually costs you money when operating, the boiler itself. Just as a control that will modulate the boiler temperature will save you money so will a boiler with a soft graduated start-up...

The new boiler will be as efficient as it is possible to manufacture which means it’ll be a Range Rover not a Land Rover eg built to work under ideal conditions not any conditions. If your friend is staying there change it all.

Run cold or hot taps elsewhere

Not entirely the case and it rather depends on the boiler but high spec entry level boilers will modulate on both flow and return and start -up from a graduated range rated output (not maximum heating output) and increase output dependent on duration of demand.

This is a rehashed post from a gas group I belong to, I did this from the 7th Jan to yesterday. might be of some interest. Using the new pre-production server and wi-fi gateway but the old BeSmart room control. Control system comparisons There are often posts from customers and installers...

Read your gas meter at a set time run the heating as you normally do for a period then read the meter again. Next period run the heating the way you speculate may be better, same period hopefully similar weather then read you meter. The results are your own and not a comparison with someone...