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Topic Title: Storage heater replacement
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Created On: 29 September 2017 11:36 AM
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 29 September 2017 11:36 AM
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SKElectrical

Posts: 1115
Joined: 01 February 2009

Surveyor's report tells Client that his storage heaters are poor and inefficient, so Client wants new instant heaters.
Only a 60A supply to flat.
Electric only power.
Shower
Cooker
2kW heater
1.5kW heater
1.0KW heater
1.0kW heater.
3kW water heater.

Max DEMAND??
What are your thoughts?
 29 September 2017 11:51 AM
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AJJewsbury

Posts: 15812
Joined: 13 August 2003

Modern storage heaters might be a better idea, but I suppose the customer is always right...

Maybe do a quick heat loss calculation to see if 5.5kW is really going to be a realistic sustained load (it seems quite a lot for flat to me, but depends on its size/shape/position and how well insulated it is).

If you're still worried, perhaps put in a load shedding relay so that the space heating is switched off when the shower is in use?

- Andy.
 29 September 2017 12:25 PM
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alancapon

Posts: 6879
Joined: 27 December 2005

Originally posted by: SKElectrical
Surveyor's report tells Client that his storage heaters are poor and inefficient . . .

So how does that work then? 100% of the energy bought goes towards heating the room it is in, and you can store the energy during the cheap tariff times for use later in the day when it is needed . . .

Regards,

Alan.
 29 September 2017 12:34 PM
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AJJewsbury

Posts: 15812
Joined: 13 August 2003

So how does that work then? 100% of the energy bought goes towards heating the room it is in, and you can store the energy during the cheap tariff times for use later in the day when it is needed

I guess most of the "inefficiency" comes from providing heat when it's not required (e.g. because today is warmer/sunnier than usual).
- Andy.
 01 October 2017 12:22 AM
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sparkingchip

Posts: 9953
Joined: 18 January 2003

Has this been highlighted on the energy efficiency assessor report or the building surveyors report?

Andy B.
 01 October 2017 03:13 AM
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Jaymack

Posts: 5356
Joined: 07 April 2004

Originally posted by: SKElectrical
Surveyor's report tells Client that his storage heaters are poor and inefficient, so Client wants new instant heaters.

Heat is heat is heat. It will be stored in the fabric of the building and furnishings etc. Storage heating of any form, should only be considered as background heating, it won't cater for sudden variations in temperature. Fan assisted storage heaters, will distribute the stored heat more quickly in the short term; however top up heating, should be used where storage heating is installed, using the 24 hour supply if electric. I think that a complaint should be made against the surveyor.

Regards
 01 October 2017 09:12 PM
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SKElectrical

Posts: 1115
Joined: 01 February 2009

I had assumed the findings were from one of those 15minute energy surveys but it may well have been part of the 16minute building surveys (either way money well spent).
So the thinking is I can indeed install instantaneous heaters.
As regards the load shedding relay... how is it activated by the shower? What feeds A1?
 01 October 2017 09:57 PM
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UKPN

Posts: 659
Joined: 17 January 2012

Putting aside the debate regarding the on peak/off peak heating, the question was max demand required. We are looking on the evidence at around 78 amps. Adding a few lamps, a couple of televisions, computers, fridge, freezer, washing machine, tumble dryer-have I missed anything? We would want to upgrade our service in this all-electric home to 100amps. Staying on the Economy 7 tariff for off peak energy would enable the consumer to stay with the existing service.

Regards, UKPN
 02 October 2017 09:25 AM
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AJJewsbury

Posts: 15812
Joined: 13 August 2003

As regards the load shedding relay... how is it activated by the shower? What feeds A1?

The shower feed goes through the load shedding relay- the relay senses the current flow and switches its output accordingly. E.g. see how its done for shower priority units (in your case you just have the space heating rather than a 2nd shower).
http://www.meteorelectrical.co...Boards_1452600737.pdf

You can buy the relay on its own http://www.meteorelectrical.co...ent-sensing-relay.html and team it up with an appropriate contactor for your other loads (perhaps high rated if all on once circuit or multipole if several separate circuits).

- Andy.
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