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Topic Title: Electric Combi Boilers?
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Created On: 29 September 2013 05:36 PM
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 29 September 2013 05:36 PM
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briggsy6

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Joined: 24 September 2003

Has anybody installed such a beast as a direct replacement for an existing gas boiler combi boiler? If so, have you managed to find one that is smaller than an airing cupboard?
 29 September 2013 06:39 PM
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prophet

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Went to price up fitting a hetrae sadia electromax last week. Bout 500x500x1500 at a guess.

Depends if its a walk-in airing cupoboard ;-)
 30 September 2013 08:24 AM
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broadgage

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I dont think that a true replacement for a gas combi boiler is viable with electricity.
A combi boiler has no storage, the heating or hot water demand is supplied by burning gas on demand.
In order to produce a good flow of hot water, the energy demand of a gas combi boiler is often 30KW or more.
To meet that demand with electricity is well over 100 amps from a single phase supply. Not actually impossible of course, but not viable from a standard domestic service which seldom exceeds 100 amps single phase, in total.

There are numerous electric central heating and hot water supply systems, but all that I know off contain storage so as to meet the peak demand of filling a bath at a reasonable rate.

Such systems seldom make economic sense unless the storage is big enough that a fair bit of the daily demand can be met from off peak electricity.
 30 September 2013 09:52 AM
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AJJewsbury

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Has anybody installed such a beast as a direct replacement for an existing gas boiler combi boiler? If so, have you managed to find one that is smaller than an airing cupboard?

These look roughly similar to gas boiler sizes: http://www.tlc-direct.co.uk/Ma...ing_Boilers/index.html

- Andy.
 30 September 2013 11:14 AM
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broadgage

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Originally posted by: AJJewsbury

Has anybody installed such a beast as a direct replacement for an existing gas boiler combi boiler? If so, have you managed to find one that is smaller than an airing cupboard?


These look roughly similar to gas boiler sizes: http://www.tlc-direct.co.uk/Ma...ing_Boilers/index.html



- Andy.


Yes, but only 15KW, that is a lot of electricity to supply, but still rather a limited flow of hot water for filling a bath reasonably quickly.
 30 September 2013 08:53 PM
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briggsy6

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Pain, isn't it? The best solution I've managed to come up with is a reasonably compact heating-only boiler with a multi-point heater for hot water with a relay arrangement switching between the two.

Cheers for the responses, guys.
 30 September 2013 10:32 PM
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Pacific

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I installed one yonks ago, basically a big storage heater about the size of a single wardrobe, with a heat exchanger & pump in the bottom and a fan which drew air through the bricks, it certainly heated the house ok and hot water. From memory it was about 20Kw 3 phase, Elec board chucked in TP supply FOC
 04 October 2013 12:03 PM
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citywidegas

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The boiler is held in place by two large nuts on the inlet and outlet pipes, which clamp the boiler to the back of the stove. This information will surely helpful for you.
 04 October 2013 10:25 PM
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largelunchbox

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ive installed one in my house, i didnt have a combi gas boiler but a conventional boiler and megerflow hot water tank. the new electric boiler is only 10cm sq and approx 120cm long, its has 4 x 3kw elements. works a treat
 04 October 2013 11:47 PM
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westfield6

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Why would anyone want an electric combo boiler? Electricity at almost 10p per KWh is around 3 times the cost of gas. OK electricity is around 100% efficient against a modern gas boilers 90% but!!!
 05 October 2013 01:01 PM
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Pacific

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Originally posted by: westfield6

Why would anyone want an electric combo boiler? Electricity at almost 10p per KWh is around 3 times the cost of gas. OK electricity is around 100% efficient against a modern gas boilers 90% but!!!


Plenty of properties around with no mains gas

 05 October 2013 07:52 PM
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SKElectrical

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Originally posted by: westfield6
electricity is around 100% efficient


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