I'm in a ground floor flat. Water tanks were in the flat, not in an attic space so took up a lot of room. Add to that, the ones in there were pre-historic (and there was no central heating) and a combi was a no-brainer for me.
Like I said earlier, not had a single problem with it in three years (I have an extended five year warranty on it). Shower is far better than an electric and heating works just great.
If it does pack in, I guess I'll be having lukewarm baths for a day or two until it's fixed, but I still wouldn't go back to water tanks in my place ...
Potterton do a 40 kw boiler for less than a £1000 with a 7 year parts and labour guarantee that gives 16 litres of water at 35 degree rise iirc
My tank fed bath tap gives 8 litres a minute
Potterton do a 40 kw boiler for less than a £1000 with a 7 year parts and labour guarantee that gives 16 litres of water at 35 degree rise iirc
My tank fed bath tap gives 8 litres a minute
The problem with such a massive boiler is it will never modulate low enough to even match the heating load of the house, meaning decreased efficiency. The increasingly large combi's are just a lazy alternative to a proper boiler/unvented cylinder set up.
The problem with such a massive boiler is it will never modulate low enough to even match the heating load of the house, meaning decreased efficiency. The increasingly large combi's are just a lazy alternative to a proper boiler/unvented cylinder set up.
Of course it would. Most 40kw combi's modulate to ~5kw. It only uses the 40kw when it's on hot water mode.
Of course it would. Most 40kw combi's modulate to ~5kw. It only uses the 40kw when it's on hot water mode.
The Potterton's modulate on a 4:1 ratio so the mimimum it can run at is ~10 kW. I only know of Vokera offering much higher ratios, most manufacturers don't because higher ratios increase electrical consumption, negating any saving made in burning less gas.
Checked the instructions and you are correct it is 12.1 kw minimum on heating but in the kind of house you are likely to fit a 40 kw boiler it is not likely to be a problem
We are intending to zone up and downstairs with programable stats and fit one shower with instant electric shower for back up
Most probs in my experience are with diverter valves scaling up
Comments
I'm in a ground floor flat. Water tanks were in the flat, not in an attic space so took up a lot of room. Add to that, the ones in there were pre-historic (and there was no central heating) and a combi was a no-brainer for me.
Like I said earlier, not had a single problem with it in three years (I have an extended five year warranty on it). Shower is far better than an electric and heating works just great.
If it does pack in, I guess I'll be having lukewarm baths for a day or two until it's fixed, but I still wouldn't go back to water tanks in my place ...
My tank fed bath tap gives 8 litres a minute
If you have to boil a kettle to fill a bath with a combi then you're not using it right.
The problem with such a massive boiler is it will never modulate low enough to even match the heating load of the house, meaning decreased efficiency. The increasingly large combi's are just a lazy alternative to a proper boiler/unvented cylinder set up.
What, the kettle or the combi?
Of course it would. Most 40kw combi's modulate to ~5kw. It only uses the 40kw when it's on hot water mode.
The Potterton's modulate on a 4:1 ratio so the mimimum it can run at is ~10 kW. I only know of Vokera offering much higher ratios, most manufacturers don't because higher ratios increase electrical consumption, negating any saving made in burning less gas.
We are intending to zone up and downstairs with programable stats and fit one shower with instant electric shower for back up
Most probs in my experience are with diverter valves scaling up