Which combination storage boiler should i go for?

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Rinnai Twinflow.
 
Excellent suggestion Lee! In fact so good that I suggested it on Page 1 ;)
 
GaytonTonner said

The Multicalor gives 20kW,heated by a combi, or any other boiler. IT matches any 20kW Lennox.


Do I recall you advising the OP that he will need to massively upgrade his insulation if he takes on your superb ideas? No.

Anyone with a warm air system will tell you that the house cools down quickly once the system turns off. For you to recommend your silly combi and fan coil to innocent parties here as a tried and tested solution for anything other than newbuild is reckless.

Houses insulated to modern standards and fitted with warm air systems don't exist. No modern houses have been fitted with warm air in the last 20yrs, it is all replacements in pre 1990 properties, which have abysmal levels of insulation.

GT, you are dismissive of qualified tradesmen. But we inhabit a World unlike yours where our proposals and designs have to work, or we don't get paid. It is our living.

Pretending to be something you are not is easily achieved on the internet. You aren't very good at it, otherwise you wouldn't be on your 5th username on this forum.
 
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GaytonTonner said

The Multicalor gives 20kW,heated by a combi, or any other boiler. It matches any 20kW Lennox.

Do I recall you advising the OP that he will need to massively upgrade his insulation if he takes on your superb ideas? No.

Why would he need to do that? The Multicalor is available in larger kW outputs.

Anyone with a warm air system will tell you that the house cools down quickly once the system turns off. For you to recommend your silly combi and fan coil to innocent parties here as a tried and tested solution for anything other than newbuild is reckless.

I have fitted many and they work brilliantly. You have never heard of the Multicalor, or of this simple, cost effective, less hassle, superior solution, that is clear.

Houses insulated to modern standards and fitted with warm air systems don't exist.

You are showing your ignorance. Scaled down versions of forced air are fitted in Heat Recovery and Vent Systems in highly insulated homes. The insulation levels in 2013 means only partial heating system are needed. Heat Recovery and Vent with in-duct heating does the job. The heat requirements are so low a copper duct coil or electric element is in the ductwork to supply the low heat requirements. These are currently usually in upmarket new homes. In 2013, they will be in most new homes.
This ducting system company is doing well:
http://www.unicosystem.co.uk/

There are many Heat Recovery and Vent System companies doing very well in Britain selling to the domestic market.
Some of the companies who are involved:
http://www.theconstructioncentre.co.uk/products/ventilation/heat-recovery-ventilation/

Villavent are strong and in new builds:
http://www.villavent.co.uk/heat-recovery-ventilation-uk.htm

The integrated heating in highly insulated homes with Heat Recovery and Vent is called Comfort Heating.
http://www.villavent.co.uk/domestic-ventilation-systems.htm

You are reverting to insults because you really do not understand the business that well. It is best you get to know it more and the way it is headed. In new builds it is Heat Recovery and Vent with Comfort Heating in the ductwork. You will never get to know the business well being on the tools changing boilers.
 
in terms of the site - its a pretty standard sized house and feel i have given sufficient information to gain reasonable guidance for now but appreciate your point to some degree

What size is the existing warm air unit in kW or BTU/hr?

The unit which no longer works is a j54-64 j&S

the documentation states the following:

15.8-18.8kw (57mj/h, 54,000btu,/h to 67.5mj/h, 64,000but/h

The 20kW Multicalor is a perfect replacement. It will sit nicely on the plenum of the old J&S. Go for any high flow quality combi. Two bathrooms? two full baths? Or one bath and one shower en-suite (1.5 baths). If 1.5 baths go for the 39C Avantaplus combi.

This is minimum disruption and cheaper than an inadequate rad system. Why fit an inferior rad system? You will not be disappointed. Customers are delighted with the changes.
 
The integrated heating in highly insulated homes with Heat Recovery and Vent is called Comfort Heating.
http://www.villavent.co.uk/domestic-ventilation-systems.htm

Thanks for the info, fascinating.

I fitted one of these in my house 5 years ago. Didn't need the advice of an out of work internet troll then, still don't. :cool:

You are reverting to insults because you really do not understand the business that well. It is best you get to know it more and the way it is headed. In new builds it is Heat Recovery and Vent with Comfort Heating in the ductwork. You will never get to know the business well being on the tools changing boilers.
 
This ducting system company is doing well:
http://www.unicosystem.co.uk/

Fitted a few of these commercially hooked up to big buffers.....
Nice kit to work with and would have been happy to have installed it full time.
Works well of course providing the energy is there to drive it. With HR thats not always the case.
They were trying to push into the large residental home market I remember. Not sure how successful they were. Do know one guy who considered it and opted for ufh instead.
A lot of people are put off by the air vents. In a supermarket thats not an issue.
 

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